Description of the new feature

ConPTY's reflow algorithm may differ from the hosting terminal and that may result in ConPTY returning wildly incorrect cursor positions via GetConsoleCursorInfo. This results in the cursor being inside the previous prompt when resizing PowerShell in VS Code.

Proposed technical implementation details

Use the existing DSC CPR facilities in VtIo but make them more flexible so that they can be called more than once.

Complications:

• The request must block the console server
• ...but it must not block further incoming resizes (= debounce)