A hidden mouse cursor won't reappear when moved if over a tab

[j4james]

Environment

Windows build number: Version 10.0.18363.1256
Windows Terminal version (if applicable): commit d29d72e

Steps to reproduce

1. You'll need to be running a build of WT that includes the mouse hiding feature introduced in PR Teach terminal to hide mouse while typing #8629.
2. Move the mouse so it's positioned over one of the tab labels.
3. Start typing something so the mouse cursor disappears.
4. Try and move the mouse, but without moving off the label.

Expected behavior

The mouse cursor should reappear.

Actual behavior

The mouse cursor remains invisible until you move it onto the main output area of the window. But you can still see focus interactions, and tooltips changing, as you move over the tab controls.

Interestingly, if you move the mouse right off the WT window, it will become visible, but then moving back onto a tab will make it disappear again.

[Don-Vito]

😢 - I guess the TabView is capturing the pointer move events somehow.

[Don-Vito]

I tried the following

1. Added PointerMoveHandler to TerminalPage - it didn't help, the event is not getting fired (probably the TabView captures the pointer)
2. Added PointerEntered and PointerExited to the TerminalControl, and changed the logic so the Hide will be fired only if the mouse within the bounds of the termcontrol. The problem is that sometimes PointerEntered is not triggered (e.g., when you close a fly-out)
3. Added a VisualTreeHelper upon hide, to check if TermControl captures pointer position. Seems extremely inefficient.

[DHowett]

Oof, yeah. I had similar trouble with the implementation of the I-beam cursor over the control. It drives me mad that the cursor is a property of the application window, but controls need to individually set it. Absolutely mad.

[DHowett]

/cc @zadjii-msft triage decision: 1.7

[Don-Vito]

@DHowett - is it still possible to fix / rollback it for 1.6 Preview?

[DHowett]

NOPE, but I can include a rollback or a fix in a servicing update.

[zadjii-msft]

That's W I L D. I don't think it's that bad that we need to release a 1.6 hotfix to roll this back, but we should definitely have a fix for 1.6 stable.

[j4james]

Yeah, the only reason I noticed this was because I was doing some testing where I needed to repeatedly open and close a tab, and I had the mouse hovering over the tab so I could quickly get to the close button. That's not exactly typical usage, so I think it's unlikely many people will encounter this issue.

[ghost]

🎉This issue was addressed in #8952, which has now been successfully released as Windows Terminal Preview v1.6.10412.0.:tada:

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