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which is more correct than the previous commit

- ignore button 1 release if we are button-2-scrolling
- ignore button 2 release if we are not button-2-scrolling

in order to be safe against whatever windowing system / event manager
depending event order. Also properly update the tool's state after a
button reelease, and after a space release.

Use gdk_window_get_display() (available since GTK+ 2.24 which we now
depend on) and not gdk_drawable_get_display(), which is deprecated.

tool_manager_select_tool(): don't reset the previously active tool if
it is only temporarily pushed to the tool stack.

tool_manager_pop_tool(): don't try to restore the previously active
tool's state because it was not reset on push().

because pushing sets its focus_display which is now only possible
while the a tool is not active.

Also halt it uncontitionally in button_release() because we can't
get there any longer if the tool isn't active.

We depend on GTK+ 2.24 now.

This reverts commit 0e55c5e4.

and completely separate configure and sanity checks for gdk-pixbuf
from GTK+, because it's now distributed as a separate package. Remove
all sorts of conditional compiling based on GDK_CHECK_VERSION() and
CAIRO_VERSION.

such as masks and outlines. The cache is currently very stupid and
only cacheds the last transformed object. Add caches to GimpBrush for
its mask, its pixmap and its boundary, and remove the same caches and
a ton of members from GimpBrushCore. This involves adding lots of
const qualifiers because GimpBrush returns const pointers now for
trasnformed stuff.

and use them in GimpBrushCore when setting/unsetting a brush. They
will be used for managing some caches inside GimpBrush.

by checking for an actual change in the setters. Remove the
"foo != core->foo" checks from all callers.

going back to edit mode, edit the cage then going to deform mode

and remove that code from gimpbrush-boundary.c

There is infinite room for optimization, but the API and pixel-perfect
functionality is there, which is step one.

so paths can be rendered at any position. Pass 0,0 from all places
that draw GimpVectors.

as a separate commit because it reindents the entire header.

and some minor coding style cleanup.