There is a range of 216 colors in the default 256-color table that is
meant to be initialized with a 6x6x6 color cube, with each color
component iterating over the values `00`, `5F`, `87`, `AF`, `D7`, and
`FF`. A few of the entries incorrectly had the _red_ component has `DF`,
when it should have been `D7`. This PR corrects those entries. It also
removes a bit of unnecessary whitespace in the first 100 entries.
## Validation Steps Performed
I have a visual test script that renders the full 256-color palette,
using both the indexed color sequence (`SGR 38;5`) and the equivalent
rgb representation (`SGR 38;2`) side by side. Although the difference
was subtle when it was incorrect, I can now see that it has been fixed.
Closes#5994
This removes all glyphs from the emoji list that do not default to
"emoji presentation" (EPres). It removes all local overrides, but retains
the comments about the emoji we left out that are Microsoft-specific.
This brings us fully in line with the most popular Terminals on OS X,
except that we squash our emoji down to fit in one cell and they let
them hang over the edges and damage other characters. Oh well.
## Detailed Description of the Pull Request / Additional comments
Late Friday evening, I tested my emoji test file on iTerm2. In so doing, I realized
that @j4james and @leonMSFT were right the entire time in #5914: Emoji
that require `U+FE0F` must not be double-width by default.
I finally banged up a powershell script that parses the UCD and emits a codepoint
width table. Once checked in, this will be definitive.
Refs #900, #5914.
Fixes#5941.
The `bcz.cmd` script calls a powershell helper script (bx.ps1), but
(previous to this change) did not pass `-NoProfile`, which means that
powershell.exe would load and run one's personal profile script, which
can only slow things down, and worse, can change default behaviors (such
as turning on strict mode by default, which will cause scripts that
don't run cleanly with strict mode to generate lots of errors--such as
bx.ps1).
This change amends the powershell.exe command line to pass -NoProfile,
as well as to set the execution policy and ensure that interactive
prompts can't inadvertently show up (normal best practices for use of
powershell in build scripts).
This change will speed things up (probably negligibly, but still) and
(more importantly) prevent non-determinism and errors that could result
from running people's profile scripts when running the helper bx.ps1.
This pull request moves swaths of Cascadia to use `til::color` for color
interop. There are still some places where we use `COLORREF`, such as in
the ABI boundaries between WinRT components.
I've also added two more til::color helpers - `with_alpha`, which takes
an existing color and sets its alpha component, and a
`Windows::UI::Color` convertor pair.
Future direction might include a `TerminalSettings::Color` type at the
idl boundary so we can finally stop using UInt32s (!) for color.
## Validation Steps Performed
Tested certain fragile areas:
* [x] setting the background with OSC 11
* [x] setting the background when acrylic is in use (which requires
low-alpha)
The AKB serializer is used in the tracelogging pipeline.
Chatted with @zadjii-msft about ganking the deserializers. The form
they'll take in the future is probably very different from this.
We'll need to have some better tracking of the _source_ or _pass_ a
setting was read during so that we can accurately construct an internal
settings attribution model. Diffing was very extremely cool, but we
didn't end up needing it.
This apparently drops our binary size by a whopping _zero bytes_ because
the optimizer was smarter than us and actually totally deleted it.
This seems to be in line with the emoji-sequences table in the latest
version of the Unicode standard: those glyphs require U+FE0F to activate
their emoji presentation. Since we don't support composing U+FE0F, we
should not present them as emoji by default.
Fixes#5910.
Yes, I hate this.
My workflow is to use Sublime's <kbd>Ctrl+P</kbd> shortcut to navigate to files by name. However, the propsheet version of the files _always_ comes up before the `TerminalApp` one does. This results in me having to close the file and re-open the right one.
This PR renames the propsheet one, so it's unambiguous which one I'm opening.
It's really the most trivial nit.
## Summary of the Pull Request
When we're dragging the tab around, if you execute a `ClosePane`/`CloseTab`, then we should make sure to actually activate a new tab, so that focus doesn't just fall into the void.
## References
* This is almost exactly #5799, but with rearranging tabs
## PR Checklist
* [x] Closes#5559
* [x] I work here
* [ ] Tests added/passed
* [n/a] Requires documentation to be updated
## Detailed Description of the Pull Request / Additional comments
We suppress `_OnTabItemsChanged` events during a rearrange, so if a tab is closed while we're rearranging tabs, the we don't fire the `SelectionChanged` event that we usually do during a close that would select the new tab.
## Validation Steps Performed
* Tested manually
- Confirmed that tragging a tab out, closing it, then dragging it back in does nothing.
This PR reverts a relatively minor change that was made incorrectly to
ConPTY in #5771.
In that PR, I authored two tests. One of them actually caught the bug
that was supposed to be fixed by #5771. The other test was simply
authored during the investigation. I believed at the time that the test
revealed a bug in conpty that was fixed by _removing_ this block of
code. However, an investigation itno #5839 revealed that this code was
actually fairly critical.
So, I'm also _skipping_ this buggy test for now. I'm also adding a
specific test case to this bug.
The problem in the bugged case of `WrapNewLineAtBottom` is that
`WriteCharsLegacy` is wrapping the bottom row of the ConPTY buffer,
which is causing the cursor to automatically move to the next line in
the buffer. This is because `WriteCharsLegacy` isn't being called with
the `WC_DELAY_EOL_WRAP` flag. So, in that test case,
* The client emits a wrapped line to conpty
* conpty fills the bottom line with that text, then dutifully increments
the buffer to make space for the cursor on a _new_ bottom line.
* Conpty reprints the last `~` of the wrapped line
* Then it gets to the next line, which is being painted _before_ the
client emits the rest of the line of text to fill that row.
* Conpty thinks this row is empty, (it is) and manually breaks the row.
However, the test expects this row to be emitted as wrapped. The problem
comes from the torn state in the middle of these frames - the original
line probably _should_ remain wrapped, but this is a sufficiently rare
case that the fix is being punted into the next release.
It's possible that improving how we handle line wrapping might also fix
this case - currently we're only marking a row as wrapped when we print
the last cell of a row, but we should probably mark it as wrapped
instead when we print the first char of the _following_ row. That work
is being tracked in #5800
### The real bug in this PR
The problem in the `DeleteWrappedWord` test is that the first line is
still being marked as wrapped. So when we get to painting the line below
it, we'll see that there are no characters to be printed (only spaces),
we emit a `^[20X^[20C`, but the cursor is still at the end of the first
line. Because it's there, we don't actually clear the text we want to
clear.
So DeleteWrappedWord, #5839 needs the `_wrappedRow = std::nullopt;`
statement here.
## References
* I guess just look at #5800, I put everything in there.
## Validation Steps Performed
* Tested manually that this was fixed for the Terminal
* ran tests
Closes#5839
A couple of codepoints, namely the card suites, male and female signs,
and white and black smiling faces were changed to have a two-column
width as part of #5795 since they were specified as emoji in Unicode's
emoji list v13.0[1].
These particular glyphs also show up in some of the most fundamental
code pages, such as CP437[2] and WGL4[3]. We should
not be touching the width of the glyphs in these codepages, as suddenly
changing a long-time-running narrow glyph to use two-columns all of a
sudden will surely break (and has already broken) things.
[1] https://www.unicode.org/Public/13.0.0/ucd/emoji/emoji-data.txt
[2] https://en.wikipedia.org/wiki/Code_page_437
[3] https://en.wikipedia.org/wiki/Windows_Glyph_List_4Closes#5822
Terminal should try not to join the choir invisible when the clipboard
API straight up horks it.
This accounts for ~3% of the crashes seen in 1.0RC1 and ~1% of the
crashes seen all-up in the last 14 days.
## Repro (prior to this commit)
Set `"copyOnSelect": true`.
Copy something small.
Hold down <kbd>Ctrl+Shift+V</kbd>
Double-click like your life depends on it. Double-click like you're
playing cookie clicker again. 2013 called, it wants its cookies back.
Fixes#4906.
It turns out that we weren't really adequately guarding calls to
SetSelectionEnd and friends.
We're clearing the active selection when the window resizes, but we're
doing so by nulling out the std::optional<Selection> it lives in. Later,
though, when we set the selection endpoint we're using "_selection->".
Optional's operator-> has undefined behavior when the optional doesn't
have a value in it.
In our case, it looks like it was returning whatever the value was prior
to it being emptied out. PivotSelection would attempt to access an
out-of-bounds coordinate when the buffer got smaller during a resize.
The solution is to guard both levels of selection endpoint manipulation
in a check for an active selection.
Apparently, this accounts for somewhere between 7% and 14% of our
crashes on 1.0RC1.
Repro was:
Use Win+Arrow to snap the window while in the middle of a selection.
## Summary of the Pull Request
Adds user settings to adjust rendering behavior to mitigate blurry text on some devices.
## References
- #778 introduced this, almost certainly.
## PR Checklist
* [x] Closes#5759, mostly
* [x] I work here.
* [ ] We need community verification that this will help.
* [x] Updated schema and schema doc.
* [x] Am core contributor. Discussed in Monday sync meeting and w/ @DHowett-MSFT.
## Detailed Description of the Pull Request / Additional comments
When we switched from full-screen repaints to incremental rendering, it seems like we exposed a situation where some display drivers and hardware combinations do not handle scroll and/or dirty regions (from `IDXGISwapChain::Present1`) without blurring the data from the previous frame. As we're really close to ship, I'm offering two options to let people in this situation escape it on their own. We hope in the future to figure out what's actually going on here and mitigate it further in software, but until then, these escape hatches are available.
1. `experimental.rendering.forceFullRepaint` - This one restores the pre-778 behavior to the Terminal. On every single frame paint, we'll invalidate the entire screen and repaint it.
2. `experimental.rendering.software` - This one uses the software WARP renderer instead of using the hardware and display driver directly. The theory is that this will sidestep any driver bugs or hardware variations.
One, the other, or both of these may be field-applied by users who are experiencing this behavior.
Reverting #778 completely would also resolve this, but it would give back our largest performance win in the whole Terminal project. We don't believe that's acceptable when seemingly a majority of the users are experiencing the performance benefit with no detriment to graphical display.
## Validation Steps Performed
- [x] Flipped them on and verified with the debugger that they are being applied to the rendering pipeline
- [ ] Gave a private copy to community members in #5759 and had them try whether one, the other, or both resolved their issue.
This is an attempt to simplify the SGR (Select Graphic Rendition)
implementation in conhost, to cut down on the number of methods required
in the `ConGetSet` interface, and pave the way for future improvements
and bug fixes. It already fixes one bug that prevented SGR 0 from being
correctly applied when combined with meta attributes.
* This a first step towards fixing the conpty narrowing bugs in issue
#2661
* I'm hoping the simplification of `ConGetSet` will also help with
#3849.
* Some of the `TextAttribute` refactoring in this PR overlaps with
similar work in PR #1978.
## Detailed Description of the Pull Request / Additional comments
The main point of this PR was to simplify the
`AdaptDispatch::SetGraphicsRendition` implementation. So instead of
having it call a half a dozen methods in the `ConGetSet` API, depending
on what kinds of attributes needed to be set, there is now just one call
to get current attributes, and another call to set the new value. All
adjustments to the attributes are made in the `AdaptDispatch` class, in
a simple switch statement.
To help with this refactoring, I also made some change to the
`TextAttribute` class to make it easier to work with. This included
adding a set of methods for setting (and getting) the individual
attribute flags, instead of having the calling code being exposed to the
internal attribute structures and messing with bit manipulation. I've
tried to get rid of any methods that were directly setting legacy, meta,
and extended attributes.
Other than the fix to the `SGR 0` bug, the `AdaptDispatch` refactoring
mostly follows the behaviour of the original code. In particular, it
still maps the `SGR 38/48` indexed colors to RGB instead of retaining
the index, which is what we ultimately need it to do. Fixing that will
first require the color tables to be unified (issue #1223), which I'm
hoping to address in a followup PR.
But for now, mapping the indexed colors to RGB values required adding an
an additional `ConGetSet` API to lookup the color table entries. In the
future that won't be necessary, but the API will still be useful for
other color reporting operations that we may want to support. I've made
this API, and the existing setter, standardise on index values being in
the "Xterm" order, since that'll be essential for unifying the code with
the terminal adapter one day.
I should also point out one minor change to the `SGR 38/48` behavior,
which is that out-of-range RGB colors are now ignored rather than being
clamped, since that matches the way Xterm works.
## Validation Steps Performed
This refactoring has obviously required corresponding changes to the
unit tests, but most were just minor updates to use the new
`TextAttribute` methods without any real change in behavior. However,
the adapter tests did require significant changes to accommodate the new
`ConGetSet` API. The basic structure of the tests remain the same, but
the simpler API has meant fewer values needed to be checked in each test
case. I think they are all still covering the areas there were intended
to, though, and they are all still passing.
Other than getting the unit tests to work, I've also done a bunch of
manual testing of my own. I've made sure the color tests in Vttest all
still work as well as they used to. And I've confirmed that the test
case from issue #5341 is now working correctly.
Closes#5341
The table that we refer to in `CodepointWidthDetector.cpp` to determine
whether or not a codepoint should be rendered as Wide vs Narrow was
based off EastAsianWidth[1]. If a codepoint wasn't included in this
table, they're considered Narrow. Many emojis aren't specified in the
EAW list, so this PR supplements our table with emoji codepoints from
emoji-data[2] in order to render most, if not all, emojis as full-width.
There are certain codepoints I've added to the comments (in case we want
to add them officially to the table in the future) that Microsoft
decided to give an emoji presentation even if it's specified as
Narrow/Ambiguous in the EAW list and are _not_ specified in the Unicode
emoji list. These include all of the Mahjong Tiles block, different
direction pencils (✎✐), different pointing index fingers (☜, ☞) among
others. I have no idea if I've captured all of them, as I don't know of
an easy way to detect which are Microsoft specific emojis.
## Validation Steps Performed
I have looked at so many emojis that I dream emoji.
These screenshots aren't encompassing _all_ emoji but I've tried to grab
a couple from all across the codepoint ranges:
Before:
After:
[1] http://www.unicode.org/Public/UCD/latest/ucd/EastAsianWidth.txt
[2] https://www.unicode.org/Public/13.0.0/ucd/emoji/emoji-data.txtCloses#900
## Summary of the Pull Request
We accidentally missed switching one `TriggerRedrawAll` to `TriggerScroll`. This does that.
## References
#5185 - applies logic from this PR
## PR Checklist
* [X] Closes#5756
## Validation Steps Performed
Followed bug repro steps.
## Summary of the Pull Request
This PR resolves an issue with the Git for Windows (MSYS) version of `less`. It _doesn't_ use VT processing for emitting text tothe buffer, so when it hits `WriteCharsLegacy`, `WC_DELAY_EOL_WRAP` is NOT set.
When this happens, `less` is writing some text that's longer than the width of the buffer to the last line of the buffer. We're hitting the
```c++
Status = AdjustCursorPosition(screenInfo, CursorPosition, WI_IsFlagSet(dwFlags, WC_KEEP_CURSOR_VISIBLE), psScrollY);
```
call in `_stream.cpp:560`.
The cursor is _currently_ at `{40, 29}`, the _start_ of the run of text that wrapped. We're trying to adjust it to `{0, 30}`, which would be the start of the next line of the buffer. However, the buffer is only 30 lines tall, so we've got to `IncrementCircularBuffer` first, so we can move the cursor there.
When that happens, we're going to paint frame. At the end of that frame, we're going to try and paint the cursor position. The cursor is still at `{40, 29}` here, so unfortunately, the `cursorIsInDeferredWrap` check in `XtermEngine::PaintCursor` is `false`. That means, conpty is going to try to move the cursor to where the console thinks the cursor actually is at the end of this frame, which is `{40, 29}`.
If we're painting the frame because we circled the buffer, then the cursor might still be in the position it was before the text was written to the buffer to cause the buffer to circle. In that case, then we DON'T want to paint the cursor here either, because it'll cause us to manually break this line. That's okay though, the frame will be painted again, after the circling is complete.
## PR Checklist
* [x] Closes#5691
* [x] I work here
* [x] Tests added/passed
* [n/a] Requires documentation to be updated
## Detailed Description of the Pull Request / Additional comments
I suppose that's the detailed description above
## Validation Steps Performed
* ran tests
* checked that the bug was actually fixed in the Terminal
This allows me to make the build pipeline, instead of the release
engineer, put the version number in the package name.
It also lets us sign multiple packages (if we ever produce more than
one.)
## Summary of the Pull Request
Identifies and scales glyphs in the box and line drawing ranges U+2500-U+259F to fit their cells.
## PR Checklist
* [x] Closes#455
* [x] I work here.
* [x] Manual tests. This is all graphical.
* [x] Metric ton of comments
* [x] Math spreadsheet included in PR.
* [x] Double check RTL glyphs.
* [x] Why is there the extra pixel?
* [x] Scrolling the mouse wheel check is done.
* [x] Not drawing outline?
* [x] Am core contributor. Roar.
* [x] Try suppressing negative scale factors and see if that gets rid of weird shading.
## Detailed Description of the Pull Request / Additional comments
### Background
- We want the Terminal to be fast at drawing. To be fast at drawing, we perform differential drawing, or only drawing what is different from the previous frame. We use DXGI's `Present1` method to help us with this as it helps us compose only the deltas onto the previous frame at drawing time and assists us in scrolling regions from the previous frame without intervention. However, it only works on strictly integer pixel row heights.
- Most of the hit testing and size-calculation logic in both the `conhost` and the Terminal products are based on the size of an individual cell. Historically, a cell was always dictated in a `COORD` structure, or two `SHORT` values... which are integers. As such, when we specify the space for any individual glyph to be displayed inside our terminal drawing region, we want it to fall perfectly inside of an integer box to ensure all these other algorithms work correctly and continue to do so.
- Finally, we want the Terminal to have font fallback and locate glyphs that aren't in the primary selected font from any other font it can find on the system that contains the glyph, per DirectWrite's font fallback mechanisms. These glyphs won't necessarily have the same font or glyph metrics as the base font, but we need them to fit inside the same cell dimensions as if they did because the hit testing and other algorithms aren't aware of which particular font is sourcing each glyph, just the dimensions of the bounding box per cell.
### How does Terminal deal with this?
- When we select a font, we perform some calculations using the design metrics of the font and glyphs to determine how we could fit them inside a cell with integer dimensions. Our process here is that we take the requested font size (which is generally a proxy for height), find the matching glyph width for that height then round it to an integer. We back convert from that now integer width to a height value which is almost certainly now a floating point number. But because we need an integer box value, we add line padding above and below the glyphs to ensure that the height is an integer as well as the width. Finally, we don't add the padding strictly equally. We attempt to align the English baseline of the glyph box directly onto an integer pixel multiple so most characters sit crisply on a line when displayed.
- Note that fonts and their glyphs have a prescribed baseline, line gap, and advance values. We use those as guidelines to get us started, but then to meet our requirements, we pad out from those. This results in fonts that should be properly authored showing gaps. It also results in fonts that are improperly authored looking even worse than they normally would.
### Now how does block and line drawing come in?
- Block and Line drawing glyphs are generally authored so they will look fine when the font and glyph metrics are followed exactly as prescribed by the font. (For some fonts, this still isn't true and we want them to look fine anyway.)
- When we add additional padding or rounding to make glyphs fit inside of a cell, we can be adding more space than was prescribed around these glyphs. This can cause a gap to be visible.
- Additionally, when we move things like baselines to land on a perfect integer pixel, we may be drawing a glyph lower in the bounding box than was prescribed originally.
### And how do we solve it?
- We identify all glyphs in the line and block drawing ranges.
- We find the bounding boxes of both the cell and the glyph.
- We compare the height of the glyph to the height of the cell to see if we need to scale. We prescribe a scale transform if the glyph wouldn't be tall enough to fit the box. (We leave it alone otherwise as some glyphs intentionally overscan the box and scaling them can cause banding effects.)
- We inspect the overhang/underhang above and below the boxes and translate transform them (slide them) so they cover the entire cell area.
- We repeat the previous two steps but in the horizontal direction.
## Validation Steps Performed
- See these commments:
- https://github.com/microsoft/terminal/issues/455#issuecomment-620248375
- https://github.com/microsoft/terminal/issues/455#issuecomment-621533916
- https://github.com/microsoft/terminal/issues/455#issuecomment-622585453
Also see the below one with more screenshots:
- https://github.com/microsoft/terminal/pull/5743#issuecomment-624940567
If we're fullscreen, the TabView isn't `Visible`. If it's not `Visible`,
it's _not_ going to raise a `SelectionChanged` event, which is what we
usually use to focus another tab. Instead, we'll have to do it manually
here.
So, what we're going to try to do is move the focus to the tab to the
left, within the bounds of how many tabs we have.
EX: we have 4 tabs: [A, B, C, D]. If we close:
* A (`tabIndex=0`): We'll want to focus tab B (now in index 0)
* B (`tabIndex=1`): We'll want to focus tab A (now in index 0)
* C (`tabIndex=2`): We'll want to focus tab B (now in index 1)
* D (`tabIndex=3`): We'll want to focus tab C (now in index 2)
`_UpdatedSelectedTab` will do the work of setting up the new tab as the
focused one, and unfocusing all the others.
Also, we need to _manually_ set the SelectedItem of the tabView here. If
we don't, then the TabView will technically not have a selected item at
all, which can make things like ClosePane not work correctly.
## PR Checklist
* [x] Closes#5799
* [x] I work here
* [ ] Tests added/passed
* [n/a] Requires documentation to be updated
## Validation Steps Performed
Played with it a bunch
## Summary of the Pull Request
This adds a new appxmanifest for 'Windows Terminal (Preview)' and links the resources.
Code-wise, split up `WindowsTerminalReleaseBuild` into...
- WindowsTerminalOfficialBuild: [true, false]
- WindowsTerminalBranding: [Dev, Preview, Release]
Added a comment about that in release.yml
## Validation Steps Performed
used msbuild to build...
- [X] Dev
- [X] Preview
- [X] Release
then checked the msix for the correct name/icon.
[Git2Git] Merged PR 4644345: conhost: disable the DX renderer in inbox builds
We're going to be taking on some changes to the Dx renderer that are at
the very least annoying and at the very most inconsequential to the
inbox console. This commit removes support for the DX renderer from the
inbox console.
SizeBench reports that ConRenderDx contributes 55.1kb to the conhost
image (as its third largest constituent library), so this should net us
a couple pleasant WPG improvements down the line.
Related work items: #26291552 Retrieved from https://microsoft.visualstudio.com os OS official/rs_onecore_dep_uxp 6e36786d447b7975298ba31ccd77c5c649fbfbe6
Related work items: #26291552
[Git2Git] Git Train: Merge of building/rs_onecore_dep_uxp/200504-1008 into official/rs_onecore_dep_uxp Retrieved from https://microsoft.visualstudio.com os OS official/rs_onecore_dep_uxp bbdf04608ba96c3f8ee06cf100428cde01f3df79
Related work items: #26071826
This is actually related to another issue we have, #3917. I think if the system is set to "Dark" theme, but the app is set to light theme, then the brush lookup in `_ClearNewTabButtonColor` still returns to us the dark theme brushes.
Fortunately, since we're not actually setting the color of the new tab button anymore, we can just remove the call to that method now, and loop back on it later.
## References
* regressed in #3789
* related to #3917
## PR Checklist
* [x] Closes#5741
The Erase All VT sequence (`^[[2J`) is supposed to erase the entire
contents of the viewport. The way it usually does this is by shifting
the entirety of the viewport contents into scrollback, and starting the
new viewport below it.
Currently, conpty doesn't propagate that state change correctly. When
conpty gets a 2J, it simply erases the content of the connected
terminal's viewport, by writing over it with spaces. Conpty didn't
really have a good way of communicating "your viewport should move", it
only knew "the buffer is now full of spaces".
This would lead to bugs like #2832, where pressing <kbd>ctrl+L</kbd> in
`bash` would delete the current contents of the viewport, instead of
moving the viewport down.
This PR makes sure that when conpty sees a 2J, it passes that through
directly to the connected terminal application as well. Fortunately, 2J
was already implemented in the Windows Terminal, so this actually fixes
the behavior of <kbd>ctrl+L</kbd>/`clear` in WSL in the Terminal.
## References
* #4252 - right now this isn't the _most_ optimal scenario, we're
literally just printing a 2J, then we'll perform "erase line" `height`
times. The erase line operations are all redundant at this point - the
entire viewport is blank, but conpty doesn't really know that.
Fortunately, #4252 was already filed for me to come through and
optimize this path.
## PR Checklist
* [x] Closes#2832
* [x] I work here
* [x] Tests added/passed
* [n/a] Requires documentation to be updated
## Validation Steps Performed
* ran tests
* compared <kbd>ctrl+L</kbd> with its behavior in conhost
* compared `clear` with its behavior in conhost
I never got to fixing these in the original #3789 PR, but I messed up that branch way too many times already that I figured I'd just do it in post.
* [x] Fixes the typo bot in `master`
* [x] I work here
This commit introduces a context menu for Tab and a new item,
"Color...", which will display a color picker.
A flyout menu, containing a custom flyout, is attached to each tab. The
flyout displays a palette of 16 preset colors and includes a color
picker. When the user selects or clears color, an event is fired, which
is intercepted by the tab to which the flyout belongs.
The changing of the color is achieved by putting the selected color in
the resource dictionary of the tab, using well-defined dictionary keys
(e.g. TabViewItemHeaderBackground). Afterwards the visual state of the
tab is toggled, so that the color change is visible immediately.
Custom-colored tabs will be desaturated (somewhat) by alpha blending
them with the tab bar background.
The flyout menu also contains a 'Close' flyout item.
## Validation Steps Performed
I've validated the behavior manually: start the program via the start
menu. Right click on the tab -> Choose a tab color.
The color flyout is going to be shown. Click a color swatch or click
'Select a custom color' to use the color picker. Use the 'Clear the
current color' to remove the custom color.
Closes#2994. References #3327.
