### User Stories:
1. A user wants to be able to use the executable path as their starting title
- Does anyone want this?
2. A user wants to be able to set a custom starting title, but have that title be overridable
3. A user wants to be able to set an overridable starting title, different from the profile name
- Presumably someone will want this
4. A user totally wants to ignore the VT title and use something else
- This will make more sense in the post [#1320] "Support runtime variables in the custom user title" settings
### Solutions:
1. `name`, `startingTitle`, `tabTitle`
* a. `name` is only ever used as the profile name.
* b. If `startingTitle` isn't set, then the executable path is used
* c. If `startingTitle` is set, it's used as the initial title
* d. If `tabTitle` is set, it overrides the title from the terminal
* e. Current users of `tabTitle` need to manually update to the new behavior.
2. `name` as starting title, `tabTitle` as a different starting title
* a. `name` is used as the starting title and the profile name in the dropdown
* b. If `tabTitle` is set, we'll use that as the overridable starting title instead.
* c. In the future, `dynamicTabTitle` or `tabTitleOverride` could be added to support [#1320]
* d. Current users of `tabTitle` automatically get the new (different!) behavior.
* e. User Story 1 is impossible
- Does anyone want the behavior _ever_? Perhaps making that scenario impossible is good?
3. `name` unchanged, `tabTitle` as the starting title
* a. `name` is only ever used as the profile name.
* b. If `tabTitle` is set, we'll use that as the overridable starting title.
* c. In the future, `dynamicTabTitle` or `tabTitleOverride` could be added to support [#1320]
* d. Current users of `tabTitle` automatically get the new (different!) behavior.
4. `name` as starting title, `tabTitle` as different starting title, `suppressApplicationTitle` Boolean to force it to override
* a. `name`, `tabTitle` work as in Solution 2.
* b. When someone wants to be able to statically totally override that title (story 4), they can use `suppressApplicationTitle`
* c. `suppressApplicationTitle` name is WIP
* d. We'll add `suppressApplicationTitle` when someone complains
* e. If you really want story 1, use `tabTitle: c:\path\to\foo.exe` and `suppressApplicationTitle`.
[#1320]: https://github.com/microsoft/terminal/issues/1320
We've decided to pursue path 4.
* Stop the crash with fonts by trying a few fallback/backup fonts if we can't find what was selected.
* Create fallback pattern for finding a font. Resolve and pass the locale name. Retrieve the font name while retrieving the font object. Use retrieved data in the _GetProposedFont methods instead of re-resolving it.
* Add details to schema about fallback. Finish comment explaining fallback pattern to doc comment on method.
* Implement base background image alignment settings
TerminalSettings now has two new properties:
* BackgroundImageHorizontalAlignment
* BackgroundImageVerticalAlignment
These properties are used in TermControl::_InitializeBackgroundBrush to specify the alignment for TermControl::_bgImageLayer.
This is a base commit that will split into two possible branches:
* Use one setting in profiles.json: "backgroundImageAlignment"
* Use two settings in profiles.json: "backgroundImageHorizontal/VerticalAlignment"
* Implement background image alignment profile setting
Implement background image alignment as one profile setting.
* This has the benefit of acting as a single setting when the user would likely want to change both horizontal and vertical alignment.
* HorizontalAlignment and VerticalAlignment are still stored as a tuple in Profile because they are an optional field. And thus, it would not make sense for one of the alignments to be left unused while the other is not.
* Cons are that the tuple signature is quite long, but it is only used in a small number of locations. The Serialize method is also a little mishapen with the nested switch statements. Empty lines have been added between base-level cases to improve readability.
* Fix capitalization typo for BackgroundImageStretchModeKey
In Profiles.cpp, the key for the image stretch mode json property had a lowercase 'i' in "Backgroundimage", not following proper UpperCamelCase.
The "i" has been capitalized and the two usages of the constant have been updated as well.
* Document Background Image settings
* Adds entries SettingsSchema.md for the original 3 backgroundImage settings in addition to the new backgroundImageAlignment setting.
* Fix setting capitalization error in UsingJsonSettings.md
* The background image example in UsingJsonSettings.md listing a backgroundImageStretchMode of "Fill" has been corrected to "fill".
Fixes#1949.
