Inconsistent window sizing and position in dual-monitor setups under Wayland

[bitscher]

Describe the bug
Inconsistent window sizing between monitors in dual-monitor setup with different resolutions on Gnome 3.38.2 Wayland on Fedora 33.

Modifying the environment variable before calling guake by prepending env GDK_BACKEND=x11 fixes the issue which points to an issue with the existing attempt at overriding the value of GDK_BACKEND in the code.

guake/guake/main.py

Lines 57 to 67 in 9c21327

	def main():
	"""Parses the command line parameters and decide if dbus methods
	should be called or not. If there is already a guake instance
	running it will be used and a True value will be returned,
	otherwise, false will be returned.
	"""
	# Force to xterm-256 colors for compatibility with some old command line programs
	os.environ["TERM"] = "xterm-256color"
	# Force use X11 backend underwayland
	os.environ["GDK_BACKEND"] = "x11"

Expected behavior
Window size should be correct on both monitors.

Actual behavior
Window size is always the same regardless of the resolution of the monitor it's being displayed on. The position is also offset if monitors are not horizontally aligned from the top.

Monitor 0 (1080p)

Monitor 1 (1440p)

To Reproduce

• On a dual monitor setup with different monitor resolutions
• Run Gnome-shell on Wayland
• Open the terminal on monitor 1
• Close the terminal, and open it on monitor 2

$ guake --support

Guake Version: 3.6.3

Vte Version: 0.62.1

Vte Runtime Version: 0.62.1

---

GTK+ Version: 3.24.24

GDK Backend: GdkX11.X11Display

---

Desktop Session: gnome

---

Display: :0

RGBA visual: True

Composited: True

• Monitor: 0 - XWAYLAND0
  • Geometry: 1920 x 1080 at 0, 239
  • Size: 530 x 300 mm²
  • Primary: True
  • Refresh rate: 143.88 Hz
  • Subpixel layout: unknown
• Monitor: 1 - XWAYLAND1
  • Geometry: 2560 x 1440 at 1920, 0
  • Size: 600 x 340 mm²
  • Primary: False
  • Refresh rate: 143.91 Hz
  • Subpixel layout: unknown