- Removed gtk-xft-dpi read from GetGlobalContentScale. Xrm either returns either the same value as gtk-xft-dpi or the integer
scale value in cases where gtk-xft-dpi is 1.
- Refactor SDL_x11settings handlers to defer to GetGlobalContentScale
- GetGlobalContentScale is now exported and the XSettings and Gtk signal handlers now use it for consistency. This involves
a bit of extra work reading from Xrm rather than the setting notification but ensures consistent handling based on signal
origin and hints enabled.
- Hook both gtk-xft-dpi in SDL_x11settings. This should generally result in only one being called based on which is updated.
Since both signal handlers defer to X11_GetGlobalContentScale this will cause the same content scale to be applied multiple
times. The gtk-xft-dpi signal is now only used to trigger content scale updates when the XSettings notification does not occur.
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