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X11: inconsistent shadow of SSD vs CSD of attached modal dialogs

Arch Linux, mutter 3.30.2-2

Mutter draws default decoration server-side on X11. On Wayland default decoration are drawn by GTK such as client-side decorations. When Mutter draws server-side decoration for attached modal dialog, draws it WITHOUT shadow. But GTK always draws shadow, even when modal is attached.

These screens are from X11. Zrzut_ekranu_z_2019-03-06_22-37-47 Zrzut_ekranu_z_2019-03-06_22-37-54

There are two ways to fix this problem.

  • Mutter should not hide shadow for attached modal dialogs on X11.
  • Mutter should have ability (by some protocol) to ask GTK to not draw shadow.

In my opinion first solution is much better because:

  • it's easier to implement it seems to me,
  • sometimes "attached" modal dialog is not properly attached — for example when you try to logout with Firefox opened, Firefox shows its message dialog which is "attached" but main Firefox window is in different workspace — probably I will create new issue for it,
  • it's ugly if attached modal is bigger (in one axis) than main window. Example: Zrzut_ekranu_z_2019-03-06_22-46-18