[gtk] (10 commits) ...Merge branch 'wip/baedert/for-master' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  a0422bf... inspector: Fix huge listbox rows (*)
  40ee718... build: Unify two if statements (*)
  27f3600... listbox: Add preconditions to remove() (*)
  87f589f... emojichooser: Fix typo in css class (*)
  c8f4c8c... filechooserwidget: Plug a memory leak (*)
  d0f1827... sizegroup demo: Fix a checkbutton/togglebutton mixup (*)
  a6f86d9... popover: Only destroy arrow render node if position changed (*)
  e669433... listbox: Activate single-click rows if n_press >= 1 (*)
  a545fa1... inspector: Remove unsued function (*)
  e69b623... Merge branch 'wip/baedert/for-master' into 'master'

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