[gtk] (7 commits) Non-fast-forward update to branch wip/sadiq/ci

[Mohammed Sadiq <pksadiq src gnome org>]

The branch 'wip/sadiq/ci' 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:

  d429fe2... ci: Add coverage support

Commits added to the branch:

  1a4b60f... tree-list-model: Return the correct item type (*)
  03679d4... listlistmodel: Fix documentation comment (*)
  0d7c987... Revert "listlistmodel: Fix documentation comment" (*)
  29c700d... listmodels: Clarify documentation for function prototypes (*)
  2c84049... treelistmodel: Improve naming a bit (*)
  58cdd51... ci/docker: add lcov so we can create coverage reports (*)
  5d5e9e6... ci: Add coverage support

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