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device-qemu-*: set a default resolution for X11

Jakko requested to merge jakko/pmaports:qemu_X11_default_resolution into master

Commit message:

Qemu by default starts a GTK window in VGA resolution 640x480. The content adapts to this resolution, thus X11 shows up in resolution 640x480 as well.

This resolution causes some handling issues. In Xfce4 the shutdown button of the menu isn't reachable. Even worse in MATE, where the "Apply" button for changing the resolution is out of the screen, making it difficult to change the resolution.

The default resolution for X11 can be set by a config file. The Qemu GTK window resolution remains independently at default 640x480. Setting the X11 resolution to default 800x600 mitigates the issue: Most of the screen content becomes accessible while font size and button sizes are still large enough. From this point the user can adjust the resolutions of the Qemu GTK window and X11 content as desired.

I was thinking about adding this to subpackage postmarketos-base-ui-x11 but I'm not fully sure if there are other devices or use cases that have screens with X11 identifier "Virtual-1". Therefore I chose the more safe way to add this X11 config file to the qemu devices only.

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