Tooltips flicker when they can't fit on the screen

[juancampa]

Describe the bug

Tooltips flicker when they can't fit on the screen

To Reproduce
Steps to reproduce the behavior:

1. Resize screen to make it small-ish
2. Hover on a tooltip that's large enough to not fit vertically
3. observe the flickering

Expected behavior
The tooltip should not flicker

Screenshots

Peek.2022-02-11.12-58.mp4

Desktop (please complete the following information):

• OS: Linux

Additional context

[juancampa]

I investigated this a little bit, the label stops being hovered every other frame because the tooltip prevents it from staying hovered. A possible solution would be to make tooltips "transparent" to hovering. But that wouldn't work for other Area-based things, like menus.

Perhaps a better solution is to just let it overflow the screen when it can't fully fit

[emilk]

This regressed, but was fixed again:

• Tooltips flashing at 60fps in some configurations #4616
• Handle tooltips so large that they cover the widget #4623