terminal/src/cascadia/UnitTests_Control
Mike Griese 6268a4779c
Implement and action for manually clearing the Terminal (and conpty) buffer (#10906)
## Summary of the Pull Request

![clear-buffer-000](https://user-images.githubusercontent.com/18356694/127570078-90c6089e-0430-4dfc-bcd4-a0cde20c9167.gif)

This adds a new action, `clearBuffer`. It accepts 3 values for the `clear` type:
* `"clear": "screen"`: Clear the terminal viewport content. Leaves the scrollback untouched. Moves the cursor row to the top of the viewport (unmodified).
* `"clear": "scrollback"`: Clear the scrollback. Leaves the viewport untouched.
* `"clear": "all"`: (**default**) Clear the scrollback and the visible viewport. Moves the cursor row to the top of the viewport (unmodified).

"Clear Buffer" has also been added to `defaults.json`.

## References
* From microsoft/vscode#75141 originally

## PR Checklist
* [x] Closes #1193
* [x] Closes #1882
* [x] I work here
* [x] Tests added/passed
* [ ] Requires documentation to be updated

## Detailed Description of the Pull Request / Additional comments

This is a bit tricky, because we need to plumb it all the way through conpty to clear the buffer. If we don't, then conpty will immediately just redraw the screen. So this sends a signal to the attached conpty, and then waits for conpty to draw the updated, cleared, screen back to us.

## Validation Steps Performed
* works for each of the three clear types as expected
* tests pass.
* works even with `ping -t 8.8.8.8` as you'd hope.
2021-09-02 14:59:42 +00:00
..
Control.UnitTests.vcxproj Upgrade Windows SDK to 19041 (#10118) 2021-05-20 16:04:25 +00:00
ControlCoreTests.cpp Implement and action for manually clearing the Terminal (and conpty) buffer (#10906) 2021-09-02 14:59:42 +00:00
ControlInteractivityTests.cpp Fix text selection while new lines are being printed when history buffer is full (#10749) 2021-08-20 22:36:25 +00:00
MockConnection.h Switch Connections to use ValueSets to initialize them (#10184) 2021-07-20 15:02:17 +00:00
MockControlSettings.h Add an ENUM setting for disabling rendering "intense" text as bold (#10759) 2021-08-16 13:45:56 +00:00
pch.cpp Create a control unittesting project (#9677) 2021-04-05 16:07:55 +00:00
pch.h Allow ThrottledFunc to work on different types of dispatcher (#10187) 2021-08-09 15:21:59 +00:00
UnitTests_Control.def Create a control unittesting project (#9677) 2021-04-05 16:07:55 +00:00