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output/input device selection menus appear with an offset.

On Wayland compositors (sway in my case) the output and input device selection menus appear with an offset when working with more than one monitor.

With only 1 enabled output it works as expected: tooltip_offset5

As soon as you connect a second output with a fixed absolute position this happens: tooltip_offset6

How to reproduce:

Assign a second output a fixed position and disable the first output.

# swaymsg output HDMI-A-1 position 1366 0
# swaymsg output eDP-1 disable
# swaymsg -t get_outputs
Output HDMI-A-1 'Unknown HP E243 CNK9030QM3' (focused)
  Current mode: 1920x1080 @ 60.000000 Hz
  Position: 1366,0
  Scale factor: 1.000000
  Subpixel hinting: unknown
  Transform: normal
  Workspace: 3:files
  Available modes:
    [ removed for readability ]
    1920x1080 @ 60.000000 Hz

Output eDP-1 'Unknown 0x04E3 0x00000000' (inactive)
  Available modes:
    1366x768 @ 59.993000 Hz

Output eDP-1 is disabled, HDMI-A-1 stays at position 1366,0.

Tooltips and menus appear with an offset (see picture 2)

Possible solution

Discussed here: https://github.com/swaywm/sway/issues/3135#issuecomment-448794177

Short version: gtk_menu_popup() has been deprecated since version 3.22 see https://developer.gnome.org/gtk3/stable/GtkMenu.html#gtk-menu-popup

Thank you.

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