Created attachment 363167 [details]
Testcase

GtkClipboardClearFunc supplied with gtk_clipboard_set_with_owner() or gtk_clipboard_set_with_data() is not being called.

Likely related:
When using gtk_clipboard_set_with_owner(), gtk_clipboard_get_owner() returns non-NULL value even though the clipboard is owned by another application.


Affects latest GTK+ from master (version 3.93), as well as stable version 3.22.
Concerns both GDK_SELECTION_CLIPBOARD and GDK_SELECTION_PRIMARY.

Testcase included.
Steps to reproduce:
1) click the "Set clipboard" button in the test program
2) copy (Ctrl+C) something from another application
3) return back to the test program

Actual results:
GtkClipboardClearFunc is not called at all.
gtk_clipboard_get_owner() returns the owner we set in step 1), although it should return NULL, since the clipboard is owned by the app from step 2).

Expected results:
If the clipboard ownership is lost, GtkClipboardClearFunc should be called subsequently (in this case in step 3)).
If the clipboard ownership has been claimed by another application, gtk_clipboard_get_owner() should return NULL.

The behavior should correspond to the one on X11.


Build 2017-11-07 on Fedora 26