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either because we were setting the default value, or because there is
already a delay in the callback code like calling gimp_preview_update().

It's deprecated in GTK+ 2.22. Instead use g_object_set() and add a
comment as reminder to remove that too later.

Rebased/fixed to go on top of current master. Next commit will add cleanup.
Had to change author tag because gnome is not accepting random stuff
in email fields. Original author is tarai, from gimp painter project
in sourceforge.

because we idle preview anyway in GimpImageMap.

because it's the default.

- return TRUE from event handlers if we handled the event
- remove the "instant update" toggle and feature
- move the color area left of the labels now that the toggle is gone

because it's the default.

Reviewed by Petr Kovar.

and let that function alone worry about whether there actually is a
curve for that axis.

which is supposed to set up a widget for tablet events and make sure
the context changes on device changes. "supposed" because everything
is currently horribly broken on GTK+ 2.x. Use the function for all
affected widgets except for the canvas.

Backported from the gtk3-port branch.

Backported from the gtk3-port branch.

These signals fire from threads while the mainloop is blocked by GEGL, since
the callbacks of the signals expect exclusive access a mutex works for
serializing.

This can't happen on GTK+ 2.x but why should I keep this generic code
on a branch.

and make sure the core pointer is always first in the list.

This should not happen, but happens anyway on GTK+ 3.x, so better warn
about it to make debugging easier.

and use it in the toolbox. Will soon be used in more places.