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Build it unconditionally but enable it via GIMP_DEBUG=instances

because they contain reference cycles with the tool options

because they contain reference cycles with the paint options

Because some of the dialogs the factory creates add a reference to
it, creating a cycle; so simply unrefing it doesn't do anything.

The were not unrefed at all before

It was simply never destroyed at all before.

Instead, set their statically remembered pointer as a weak pointer so
it's nullified automatically if they are ever finalized. Doesn't
actually get rid of them upon exit yet, this is just a preparation.

Implement a rule of fifths guideline for GIMP. See
http://markhancock.blogspot.com/2006/03/address-basic-composition.html
for more info.

so all dockables are destroyed when a dock is destroyed.

...and with them all references their widgets keep (which are a lot).

Take ownership of the widget after creating it, so it can be reliably
unrefed upon exit.

When we are going to open new image windows, unset the transient
window. We don't need it since we will use gdk_window_raise() to
keep the dialog on top. And if we don't do it, then the dialog
will pull the image window it was invoked from on top of all the
new opened image windows, and we don't want that to happen.

Patch heavily inspiried by hack from Massimo Valentini.

Also add a manual test case for the fix. (I don't think there is GTK+
API to automate it).

The "Size" and "Sizes" labels in the GIMPressionist plugin can be more
descriptive, change them to "Size variants" and "Size depends on"
respectively.

Update development schedule. A bunch of things had to be postponed,
and I adjusted some time estimates.

New ETA: 2010-12-29.

This is evil: the hash table of "insert_data" is created on demand
when GimpContainerView API is used, using a value_free_func that is
set in the interface_init functions of its implementors. Therefore, no
GimpContainerView API must be called from any init() function, because
the interface_init() function of a subclass that sets the right
value_free_func might not have been called yet, leaving the
insert_data hash table without memory management.

Call GimpContainerView API from GObject::constructed() instead, which
runs after everything is set up correctly.

Connect to "grab-notify" and "grab-broken-event" and close the popup
when the grab is lost.

Patch from Jernej Simončič.

Make gimp_ui_synthesize_plus_key_event() generic and implement it with
gdk_test_simulate_key(). We can't use gtk_test_widget_send_key()
because its input window logic doesn't seem to work very well.