1839332 - [Wayland] "List all tabs" popup appears over its button when too large to fit the screen

Status: NEW

(Core :: Widget: Gtk, defect, P3)

Description

[Kestrel]

Attachment: Comparison with XWayland (left) showing how the tab list popup should not cover its button

STR:

1. Start with MOZ_ENABLE_WAYLAND=1 on Ubuntu 23.04.
2. Open a large number of tabs.
3. Move the window closer to the bottom edge of the screen.
4. Click the "List all tabs" button in the tab strip.

Expected:
Popup appears below or above the button.

Actual:
Popup fills the screen height and covers the button.

Does not happen with XWayland.

Not a regression.

Comment 1

[Martin Stránský [:stransky] (ni? me)]

Yes, it's because popup is managed by Waland compositor. Only thing we can to is to limit popup size according to screen size, i.e. make popup smaller than screen (say 80% of the screen size max) and then make compositor to place it.