No prevention of running link checking more than once and no visible feedback about still running checks
This is about running "check links" in the Info module, not in scheduler:
- Once "Check links" is started, you get a flash message that it started, but not when it finishes
- No check if another task is still running. This may result in several tasks being started concurrently and lead to duplicates (this is reproducible)
- If a task is still running, you get no information about it in the "Report" (just "No broken links to show"). Since the "Check links" task removes all broken links at the beginning, this can be especially misleading.
- After a check is done, the GUI should automatically switch back to "Report". This used to work, but apparently no longer does.