Make our test cases write gimpdir files in a dedicate output directory
by changing GIMP2_DIRECTORY at runtime. This ends the writing to the
source directory which make distcheck doesn't like, and it also allows
us to have a separate expected sessionrc for the session management
test. In that test we load a GIMP 2.6 formated sessionrc but write one
updated for 2.8.
We perform this change by passing the builddir through an environment
variable to the test cases. The patch also does some generalizations
in gimp-app-test-utils.c and adapts test cases accordingly.
Also do an adjustment in sessionrc on the toolbox size since
GIMP/GTK+/X/whatever has a tendency to adjust that during runs. The
new size is stable for the moment.
Get rid of 'global_toolbox_factory' and manage everything dock-related
with 'global_dock_factory'. The whole of 'global_toolbox_factory' was
a big special-case and getting rid of it makes it easier to extend the
session management with e.g. single-window mode dock functionality.
To get rid of 'global_toolbox_factory' we, roughly, have to
* Replace 'global_toolbox_factory' with 'global_dock_factory'
everywhere. We can also get rid of lots of code that did special
things for the "toolbox" factory.
* Make the use or interaction with the toolbox explicit in some
places. For example, a function gimp_dock_window_has_toolbox() has
been introduced.
* Make GimpSessionInfoDock have an 'identifier' parameter so we can
differentiate between the "gimp-dock" and "gimp-toolbox" dock
types.
Introduce GimpSessionInfoDock and session manage multi-column dock
windows. We are still backwards compatible with sessionrc, the only
difference is that a "session-info" entry now can have multiple "dock"
entries.
Also make ond dock window multi-column in the regression test
app/tests/test-session-management.c and adjust positions and image
selection menus a bit.
Add a regression test for sessionrc parsing, handing and writing. The
test work in the following way: GIMP starts so that sessionrc is
deserialized and stored internally, the UI is shown, and then the
internal data structure about windows is serialized to a new
sessionrc. The test makes sure that a new sessionrc actually has been
created, and then that the content of the new file is identical to the
old one.
