[glom] (21 commits) Created branch gtkmm4v3

[Murray Cumming <murrayc src gnome org>]

The branch 'gtkmm4v3' was created.

Summary of new commits:

  15aac60... Use gtkmm 4 instead of gtkmm 3.
  5081f96... backends: libgdamm-6.0: Update the transaction type enum.
  78ec64c... Update GdaBinary/GdaBlob code for libgdamm-6.0.
  bbbf464... gtkmm4: Use set_margin() instead of set_border_width().
  da2a67d... Comment out use of evince_view.
  687947d... Adjust GooCanvas::Table::attach() calls.
  3d757ca... EggSpreadTable: Initial port to GTK+4.
  5b917d8... gtk4: eggplaceholder: Replace get_preferred_*() with measur
  9abbf6a... gtk4: eggspreadtablednd.c: Replace gdk_window_new().
  ced8a46... gtk4: gimpruler: Change get_preferred_*() to measure().
  d919e32... Remove use of GimpRuler, sadly.
  994c6f3... fix gimpruler
  3cae0ab... gtkmm4: Remove override from add() methods.
  70afb62... gtkmm4: Remove show_all_vfunc() implementations.
  25de8ec... gtkmm4: FlowTable: Derive from WidgetCustomDraw
  a9d58d9... gtkmm4: Remove calls to show_all_children().
  cb0448c... gtkmm4: DialogExistingOrNew: const correction.
  dc21ebc... Make code slightly nicer.
  655dc4e... gtkmm4: AddDel: Add a get_value() override that takes a Row
  110dca7... gtkmm4: Remove calls to show_all().
  6d15adc... Use gtk_show_uri_on_window() instead of gtk_show_uri().