## Summary of the Pull Request
Adds the `dropdownDuration` property to `globalSummon`. This controls how fast the window appears on the screen when summoned from minimized. It similarly controls the speed for sliding out of view when the window is dismissed with `"toggleVisibility": true`.
`dropdownDuration` specifies the duration in **milliseconds**. This defaults to `0` for `globalSummon`, and defaults to `200` for `quakeMode`. 200 was picked because, according to [`AnimateWindow`](https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-animatewindow):
> Typically, an animation takes 200 milliseconds to play.
Do note that you won't be able to interact with the window during the animation! Input sent during the dropdown will arrive at the end of the animation, but input sent during the slide-up _won't_. Avoid setting this to large values!
The gifs are in Teams.
## References
* Original thread: #653
* Spec: #9274
* megathread: #8888
## PR Checklist
* [x] Closes https://github.com/microsoft/terminal/projects/5#card-59030824
* [x] I work here
* [x] Tests added/passed
* [n/a] Requires documentation to be updated
## Detailed Description of the Pull Request / Additional comments
I had the following previously in the doc comments, but it feels better in the PR body:
- This was chosen because it was easier to implement and generally nicer than:
* `AnimateWindow`, which would show the window borders for the duration of
the animation, and occasionally just plain not work. Additionally, for
`AnimateWindow` to work, the window much not be visible, so we'd need to
first restore the window, then hide it, then animate it. That would flash
the taskbar.
* `SetWindowRgn` on the root HWND, which caused the xaml content to shift to
the left, and caused a black bar to be drawn on the right of the window.
Presumably, `SetWindowRgn` and `DwmExtendFrameIntoClientArea` did not play
well with each other.
* `SetWindowPos(..., SWP_NOSENDCHANGING)`, which worked the absolute best for
longer animations, and is the closest to the actual implementation of
`AnimateWindow`. This would resize the ROOT window, without sending resizes
to the XAML island, allowing the content to _not_ reflow. but for a
duration of 200ms, would only ever display ~2 frames. That's basically
not even animation anymore, it's now just an "appear". Since that's how
long the default animation is, if felt silly to have it basically not
work by default.
- If a future reader would like to implement this better, **they should feel
free to**, and not mistake my notes here as expertise. These are research
notes into the dark and terrible land that is Win32 programming. I'm no expert.
## Validation Steps Performed
This is the blob of json I'm testing with these days:
```jsonc
{ "keys": "ctrl+`", "command": { "action": "quakeMode" } },
{ "keys": "ctrl+1", "command": { "action": "globalSummon" } },
// { "keys": "ctrl+2", "command": { "action": "globalSummon", "desktop": "toCurrent" } },
// { "keys": "ctrl+2", "command": { "action": "globalSummon", "toggleVisibility": false } },
{ "keys": "ctrl+2", "command": { "action": "globalSummon", "dropdownDuration": 2000 } },
{ "keys": "ctrl+3", "command": { "action": "globalSummon", "desktop": "onCurrent" } },
{ "keys": "ctrl+4", "command": { "action": "globalSummon", "desktop": "any" } },
```
* <kbd>ctrl+\`</kbd> will summon the quake window with a _quick_ animation
* <kbd>ctrl+2</kbd> will summon the window with a s l o w animation
6e11780ca6