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Vadim Zeitlin
036087097b
The scale of the canvas was set up correctly only once we received "size-allocate" signal from GTK, but this doesn't necessarily happen when the window is first shown and after its scale factor is actually known. Ensure that we use the correct scale by catching the notification about its change too. This makes buffer scale factor correct from the very beginning, without having to wait for a resize. See #23733, #25465.