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55d1c7e2ab
If we have the following sequence:
cache.getImageContent({ filename: "foo", cancellable: cancellable1 });
cache.getImageContent({ filename: "foo", cancellable: cancellable2 });
cancellable1.cancel();
Then the second load will complete with "null" as its content, even though
it was never cancelled, and we'll see a blank image. Meanwhile, since the
second load simply appends to the list of callers for the second load,
cancellable2 does absolutely nothing: cancelling it won't stop the load,
and it will still receive onFinished handling.
To prevent this from happening, give the actual load operation its own
Gio.Cancellable, which is "ref-counted" -- only cancel it when all the other
possible callers cancel.
Based on work from Jasper St. Pierre <jstpierre@macheye.net>
https://bugzilla.gnome.org/show_bug.cgi?id=722149
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GNOME Shell provides core user interface functions for the GNOME 3 desktop, like switching to windows and launching applications. GNOME Shell takes advantage of the capabilities of modern graphics hardware and introduces innovative user interface concepts to provide a visually attractive and easy to use experience. For more information about GNOME Shell, including instructions on how to build GNOME Shell from source and how to get involved with the project, see: http://live.gnome.org/GnomeShell Bugs should be reported at http://bugzilla.gnome.org against the 'gnome-shell' product. License ======= GNOME Shell is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for details.