Allow rendering of just uploaded not yet attached files in preview.
Adds double quotes in mysql configuration example (#12229).
Wrap issue description and its contextual menu in a div (#12211).
Fixes that test randomly fails.
Use textual CSS class for priorities in alternate theme (#12216).
Merged r10715 from trunk.
Merged r10714 from trunk.
Merged r10580 and r10581 from trunk.
Adjusts tests for the css class added in r10720 (#12216).
