mate-panel, branch zone-positioning

panel: Remove functions that are no longer used with the pack model

2026-07-10T14:57:10+00:00

These functions were part of the old pixel position model and nothing
calls them now that we use pack model for positioning.

panel: Update default layout files to use pack-type and pack-index

2026-07-10T14:51:43+00:00

Replace position and panel-right-stick with pack-type and pack-index in
all default layout files. Left-side applets use pack-type=start (the
default, so it's omitted), right-side applets use pack-type=end. Center
zone is empty by default.

data: update pack-index description

2026-07-10T14:47:25+00:00

Backported from https://gitlab.gnome.org/GNOME/gnome-panel/-/commit/6278658de

panel: Update positions of objects after removal of an object

2026-07-10T14:45:40+00:00

When an object is removed, this obviously changes the layout inside a
PanelWidget, so we have to update the positions of all objects.

Backported from https://gitlab.gnome.org/GNOME/gnome-panel/-/commit/f63d91d16

panel: Implement push move for panel objects

2026-07-10T14:42:29+00:00

We simply move all objects before/after us in our pack to the next pack.

Backported from https://gitlab.gnome.org/GNOME/gnome-panel/-/commit/533581210

panel: "Compress" indexes on end of drag

2026-07-10T14:28:14+00:00

To make sure the pack indexes never grow forever, recompute them on the
end of a drag, starting from 0. This way, we always keep a 0:n range of
indexes, instead of x:x+n with a moving x.

While it could be argued it should not be needed, it's much simpler than
specifically handling some cases where we have to explicitly decrease
all indexes, like when moving an object which is moved to another panel,
or removing an object from the panel.

This is not an action that is urgent to do (since "uncompressed"
indexes don't harm in any way), so the end of a drag is a good enough
place to call that.

Backported from https://gitlab.gnome.org/GNOME/gnome-panel/-/commit/2256381b6

panel: Implement switch move for panel objects

2026-07-10T14:28:12+00:00

A few points that are worth noticing:

 - now, when we start a drag, we always consider the drag to be started
   from the center of the object. This makes it easier to know whether
   the drag offset means we should move or not.

 - after we move an object, we have to recompute the positions of the
   objects on the panel, in pixel size. Else, we won't know how much
   space there is between two packs, which breaks moving between packs.
   This uses code that was previously in size_allocate()

 - most of the decision on whether a switch move is needed is rather
   simple to understand; it's just a matter of getting the
   additions/substractions right :-)

Note: the code for push move is not yet updated.

Backported from https://gitlab.gnome.org/GNOME/gnome-panel/-/commit/ed1054799

panel: Remove free-move mode for moving objects

2026-07-10T14:28:10+00:00

With the new packed model, free-move does not make any sense: we don't
want to move an object to an arbitrary spot; we're only interested in
switching/pushing to move an object from one pack to another pack
(switching if it's the first/last one, pushing which also push other
objects), or inside a specific pack (switching).

Backported from https://gitlab.gnome.org/GNOME/gnome-panel/-/commit/1652218bb

panel: Fix addition of objects with the new packed model

2026-07-10T14:28:07+00:00

Backported from https://gitlab.gnome.org/GNOME/gnome-panel/-/commit/cb29d47f5

panel: Add a center pack type for objects

2026-07-10T14:28:05+00:00

Woo. Of course, moving/adding objects is still a bad idea.

Backported from https://gitlab.gnome.org/GNOME/gnome-panel/-/commit/51757603d