When printing messages on the terminal, UTF-8 encoded characters are
still correctly displayed. Because "C.UTF-8" is set, not just "C".

The setting is still available in the "hidden" GSettings.

The 'Theme variant' is removed from the preferences dialog because the
work is not finished:
- There needs to be two GSettings keys for the style/color scheme.
- When the dark theme variant is selected, it should be impossible to
  choose the classic or tango style schemes (they work only with a light
  theme).

Simplify the news for the next release.
All news so far are written/summarized.

Nathan Follens authored Mar 31, 2024 and Administrator committed Mar 31, 2024

(cherry picked from commit 5815fc6f)

1. Only *hide* the bottom panel, do not *show* it when an item is
   removed (an item is removed usually because a plugin is deactivated).
2. And hide when the bottom panel becomes empty.

Same comment as previous commit.

It should be temporary, it's a first step to delegate more work from
GeditWindow to GeditSidePanel.

GeditTab anyway just re-sends the same signal coming from GeditView.

This removes the comments documenting briefly some public functions,
because the functions are already documented with gtk-doc comments in
the *.c file.

The G_GNUC_INTERNAL macro is also added.