[gtk] (22 commits) ...Merge branch 'nbpage' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  2e9c7d0... search entry: Quiet a compiler warning (*)
  74f4aec... text: Make this a final class (*)
  103637f... text: Remove has-frame leftovers (*)
  572142b... css tests: Update expected output for entries (*)
  3df4d14... assistant: Remove weak pointer in finalize (*)
  0e29408... notebook: Rename an internal macro (*)
  85fb368... Make GtkNotebookPage an object (*)
  78c54b2... Add GtkNotebookPage properties (*)
  ff4b3f1... Turn labels into page properties (*)
  7f8ba95... Allow builder to add notebook pages (*)
  f11d011... notebook: Add a pages model (*)
  c1ad721... notebook: Fix up ref counting (*)
  f64b0a7... Implement position property somewhat (*)
  0fe1091... builder-tool: Rewrite notebooks (*)
  66b6824... print dialog: Use notebook pages in ui file (*)
  ddea11b... widget-factory: Use notebook pages in the ui file (*)
  0961fe7... notebook: Fix up issues with property notification (*)
  05f8319... a11y tests: Update ui files (*)
  7d69430... css tests: Update ui files for notebooks (*)
  27f008d... builder test: Update notebooks (*)
  3eda783... tests: Update property tests (*)
  f95ed63... Merge branch 'nbpage' into 'master'

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