linux: fix GDK warning on pointer leave from an offscreen GTK web view - #86
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A crossing event has no device field to assign the way motion, button and scroll do, so the synthesized leave went out without one and GDK warned "Event with type 11 not holding a GdkDevice" on every pointer leave out of an offscreen web view. Set it through gdk_event_set_device, as the synthesized key events already do. The Desktop sample logs the warning 33 times in a 25 second run, and none after. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Issue
GDK logs this on every pointer leave out of an offscreen web view:
(Avalonia.Controls.WebView.Samples.Desktop:832198): Gdk-WARNING **: Event with type 11 not holding a GdkDevice. It is most likely synthesized outside Gdk/GTK+Fix
PointerLeaveInput now takes the pointer from the default seat and attaches it with gdk_event_set_device, which is what the synthesized events in the same file already do for the same reason.