Public bug reported:
Upstream issue: https://gitlab.gnome.org/GNOME/gtk/-/issues/7515
- Touchscreens are under "Virtual core pointer" virtual device in X11, and the
virtual device is recognized as a `GDK_SOURCE_MOUSE`.
- in `gdk/x11/gdk/x11/gdkdevicemanager-xi2.c`, `gdk_touch_event_new` is passed
with the virtual device.
- There are many places that checks whether the event is from touchscreen or
mouse, by using `gdk_device_get_source` on the device included in the event
above, which is `GDK_SOURCE_MOUSE` despite a touchscreen physical device is
used.
A ubuntu-bug report will be submitted later
** Affects: gtk4 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2119066
Title:
X11 touchscreen events are handled as mouse events
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