[FEATURE REQUEST] WM decorations (WM themes) should be automatically resizable.

Window decorations currently use raster images. Theme developers on opendesktop.org report that creating assets for different DPI settings is too time-consuming. Xfce currently suffers from poor HiDPI support, and this feature would greatly improve it.

This can be resolved by adding the ability for xfwm4 to resize decorations in-memory (using software scaling) after it loads them.

Please consider adding a new directive to .themerc, such as base-DPI=[number]. If present, this would make the theme scale according to the GTK DPI setting (labeled in Xfce as "font DPI setting"). The "number" would be the DPI value where the images need no resizing. If this number differs from the "font DPI setting," xfwm4 should automatically resize the images in-memory.

Thank you for your time and consideration.