3ac32af848
<!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? --> ## Summary of the Pull Request This PR turns all* instances of `Dispatcher().RunAsync` to WinRT coroutines 👌. This was good coding fodder to fill my plane ride ✈️. Enjoy your holidays everyone! *With the exception of three functions whose signatures cannot be changed due to inheritance and function overriding in `TermControlAutomationPeer` [`L44`](https://github.com/microsoft/terminal/blob/master/src/cascadia/TerminalControl/TermControlAutomationPeer.cpp#L44), [`L58`](https://github.com/microsoft/terminal/blob/master/src/cascadia/TerminalControl/TermControlAutomationPeer.cpp#L58), [`L72`](https://github.com/microsoft/terminal/blob/master/src/cascadia/TerminalControl/TermControlAutomationPeer.cpp#L72). <!-- Other than the issue solved, is this relevant to any other issues/existing PRs? --> ## References <!-- Please review the items on the PR checklist before submitting--> ## PR Checklist * [x] Closes #3919 * [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA * [ ] Tests added/passed * [ ] Requires documentation to be updated * [x] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #3919 <!-- Provide a more detailed description of the PR, other things fixed or any additional comments/features here --> ## Detailed Description of the Pull Request / Additional comments My thought pattern here was to minimally disturb the existing code where possible. So where I could, I converted existing functions into coroutine using functions (like in the [core example](https://github.com/microsoft/terminal/issues/3919#issue-536598706)). For ~the most part~ all instances, I used the format where [`this` is accessed safely within a locked scope](https://github.com/microsoft/terminal/issues/3919#issuecomment-564730620). Some function signatures were changed to take objects by value instead of reference, so the coroutines don't crash when the objects are accessed past their original lifetime. The [copy](https://github.com/microsoft/terminal/blob/master/src/cascadia/TerminalApp/TerminalPage.cpp#L1132) and [paste](https://github.com/microsoft/terminal/blob/master/src/cascadia/TerminalApp/TerminalPage.cpp#L1170) event handler entry points were originally set to a high priority; however, the WinRT coroutines don't appear to support a priority scheme so this priority setting was not preserved in the translation. <!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well --> ## Validation Steps Performed Compiles and runs, and for every event with a clear trigger repro, I triggered it to ensure crashes weren't introduced.
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Coding Style
Philosophy
- If it's inserting something into the existing classes/functions, try to follow the existing style as closely as possible.
- If it's brand new code or refactoring a complete class or area of the code, please follow as Modern C++ of a style as you can and reference the C++ Core Guidelines as much as you possibly can.
- When working with any Win32 or NT API, please try to use the Windows Implementation Library smart pointers and result handlers.
- The use of NTSTATUS as a result code is discouraged, HRESULT or exceptions are preferred. Functions should not return a status code if they would always return a successful status code. Any function that returns a status code should be marked
noexceptand have thenodiscardattribute. - When contributing code in
TerminalApp, be mindful to appropriately use C++/WinRT strong and weak references, and have a good understanding of C++/WinRT concurrency schemes.