News in 299.7.0, 2026-03-27
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Completion framework:
* Cherry-pick a few commits from GtkSourceView 4 to no longer use deprecated API
  and use gdk_window_move_to_rect().
* Move GtkSourceCompletionContainer to libgedit-amtk as
  AmtkTreeViewScrolledWindowSizing.
* Some code refactorings.
File loading and saving:
* Move some code to libgedit-gfls and depend on it:
  - GtkSourceIconv -> GflsIconv
  - GtkSourceInputStream -> GflsInputStream
  - Use gfls_encoding_try_convert()
Syntax highlightging:
* Improvements to the syntax highlighting of: markdown and yaml.
Other:
* A new public function in GtkSourceBuffer.
* Avoid some code duplication.
* Translation updates.