[gtk] (8 commits) ...Merge branch 'better-test-isolation-2' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  a3be0ec... Don't use xsettings or xft defaults in testsuite (*)
  85e5922... filechooser portal: Free portal proxy when bus connection c (*)
  008eb04... tests: Initialize dbus before gtk (*)
  a1856c3... a11y tests: Ignore "active" flag on toplevel (*)
  34cc680... testsuite: Fix bloomfilter style tests (*)
  d1bd127... testsuite: Make tests run without a11y bus (*)
  e41e807... css tests: Ignore ".csd" vs ".solid-csd" (*)
  8703c7b... Merge branch 'better-test-isolation-2' into 'master'

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