[gtk/matthiasc/for-master] (56 commits) ...StringList: add missing nullability annotations

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  fed734e... Fix some nullable return annotations 2 (*)
  8efde9c... broadway: make header name parsing case-insensitve (*)
  55ce61d... Add "nullable" annotation. (*)
  3680ae2... Merge branch 'matthiasc/for-master' into 'master' (*)
  7d24e14... Apply 1 suggestion(s) to 1 file(s) (*)
  39f0c48... Apply 1 suggestion(s) to 1 file(s) (*)
  56b0095... Merge branch 'master' into 'master' (*)
  b7d3c07... NEWS: Updates (*)
  365afa3... Merge branch 'arnaudb/annotate-set-title' into 'master' (*)
  32a547c... Update Catalan translation (*)
  e18211d... centerlayout: Improve docs (*)
  837f398... columnviewcolumn: Improve docs (*)
  617d12f... Merge branch 'sophie-h/gtk-nullables-2' (*)
  5a307fa... docs: Ignore more private headers (*)
  4021734... docs: Annotate the GdkContentProviderClass structure (*)
  e3fbc0e... docs: Fix typo in the GdkTolevelLayout annotation (*)
  598e130... docs: Annotate the GdkToplevel interface (*)
  6e4dd58... docs: Annotate GdkSnapshot (*)
  ecce375... docs: Annotate GdkPopup (*)
  879b284... docs: Annotate GdkPaintable (*)
  1057189... docs: Annotate GdkMemoryTexture (*)
  b9a1827... docs: Annotate GdkGLTexture (*)
  b5313db... docs: Annotate GdkDeviceTool (*)
  c524b72... docs: Annotate structure types used by GskRenderNodes (*)
  0f62ab6... docs: Annotate all render node types (*)
  8b89881... docs: Annotate the GL shader objects (*)
  37f11ab... docs: Annotate GskRenderer (*)
  eba8f36... docs: Fix annotations in GtkCenterLayout (*)
  c13e164... Make GtkCenterLayout accessors more idiomatic (*)
  4f67be1... docs: Add missing annotations for GtkTextTagTable (*)
  d46fe31... docs: Ignore more files (*)
  95400e6... docs: Annotate GtkAppChooserButton::changed (*)
  67f4594... docs: Annotate GtkAssistant::escape action signal (*)
  3e8d157... docs: Hide GtkBitsetIter fields (*)
  d820fea... docs: Annotate GtkBuildableParser (*)
  516f71b... Use the appropriate prefix for GtkBuilderClosureFlags (*)
  69b1b19... docs: Annotate missing symbols (*)
  ef36028... docs: Ignore more private files (*)
  cdad68e... docs: Ignore generated Wayland protocol file (*)
  a020c90... macos: treat some toplevel NSWindow like document windows (*)
  27b9a9e... macos: glFlush() when switching GL contexts (*)
  9e1dd15... macos: use Cairo renderer by default (*)
  770e848... Merge branch 'wip/chergert/gdk-macos-for-master' into 'mast (*)
  db456a7... Updated Spanish translation (*)
  5127726... Updated Spanish translation (*)
  2fcd0e2... Merge branch 'ebassi/for-master' into 'master' (*)
  6a3bd1c... window: default_icon_name can be null
  b5077d0... Clarify the docs for gtk_widget_class_set_css_name
  af944aa... widget: Add a missing nullability annotation
  50310f7... TreeView: add missing nullability annotations
  845d2e5... TreeModel: add missing nullability annotations
  b47ea94... TextView: add missing nullability annotations
  ec537d7... Text: add missing nullability annotations
  9d52ca1... StringFilter: get_search fix nullable annotation
  ad30ac3... Shortcut: add missing nullability annotations
  475352f... StringList: add missing nullability annotations

(*) This commit already existed in another branch; no separate mail sent