These are the menu items such as the recently opened images, or recently used
filters, etc.
Some notes:
- I added back a "placeholder" concept in the GimpMenu logic. This will allow to
place items at specific positions in the menu (either under the placeholder,
which will make the last item be on top or above the placeholder to have the
last item be in the bottom, depending on needs). Technically placeholders are
just menu items with a label (used as placeholder key) and no associated
action, which I will leave invisible.
- I add a logic for submenus so that they are invisible by default and are only
made visible when we add a menu item with an action in there.
- I removed filling the "/Filters/Recently Used/Plug-ins" placeholder. As far as
I could see, it was never filled (neither with old or new code) and the
"/Filters/Recently Used/Filters" actually already takes care of filling the
"Recently Used" submenu with both GEGL operations and plug-in calls.
- The old gimp_ui_manager_add_ui() API is for all types of menus, e.g. including
the ones created by dockables or elsewhere whereas my new API is (for now)
still specific to the top menu. This will have to be further implemented
later. I left a bunch of "TODO GMenu"-s for the time being.
- I see 2 dock-related generated items which seem to never be added, for
recently added and closed docks. It doesn't seem to work in the old API as
well. I'll want to have a closer look too.
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