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LRN requested to merge lrn/gtk:dpi-per-monitor into gtk-3-24

According to Microsoft documentation, PROCESS_SYSTEM_DPI_AWARE, just as PROCESS_DPI_UNAWARE, allows Windows to scale GTK windows and do all kinds of stuff. To ensure this doesn't happen, we need to use PROCESS_PER_MONITOR_DPI_AWARE, even if GTK does not really handle DPI changes dynamically via the WM_DPICHANGED message.

This completely prevents Windows from scaling GTK windows when they are moved between screens with different scaling set up.

Fixes #3734

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