[gtk] (14 commits) Non-fast-forward update to branch new-style-menu

[Matthias Clasen <matthiasc src gnome org>]

The branch 'new-style-menu' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  39bc6f4... widget-factory: Add another popover menu example
  46f73aa... model button: Add a role for titles
  9c172d5... widget-factory: Use the new model button role
  6a71c22... model button: Drop centered, inverted properties
  0575ce7... model button: Redo layout
  fa7993b... menu section box: Introduce more section variants
  0488b19... widget-factory: Redo the new-style menu
  84498a6... model button: Show shortcuts
  8dae4c1... Fix up the manual popover menu a bit
  a127bb9... popover menu: Fix style classes
  4c963f9... model button: Look up accels if needed
  59ec081... widget factory: Stop hardcoding accels
  40fa9f6... widget factory: Add a context menu example
  d83feea... modelbutton: Sizing fixes
  2ace97f... box layout: Handle native children

Commits added to the branch:

  6540bf2... model button: Add a role for titles
  944b6bf... model button: Drop centered, inverted properties
  3b87bb4... widget-factory: Add another popover menu example
  8ba39e7... model button: Redo layout
  89b7f77... model button: Show shortcuts
  4287870... model button: Look up accels if needed
  5cac201... menu section box: Introduce more section variants
  44c22ca... menu section box: Add style classes for display hints
  69c5862... widget-factory: Redo the new-style menu
  924cb93... widget factory: Improve manual popover menu example
  6fab98d... popover menu: Fix style classes
  b0b5699... widget factory: Add a context menu example
  9b9c337... modelbutton: Sizing fixes
  a1dd63e... box layout: Handle native children