Fix issues with the changelog dialog
* Show spinner while history is loading
* Only load history if needed (fixed)
Merge pull request #345 from SAPlayer/UI

Fix issues with the changelog dialog
Merge pull request #346 from SAPlayer/history-improvements

A few history fixes
Fix infinite history loading issue noted in #319
Don't use follow for files - too buggy (#319)
Fixed wrong filename substring (reported in #319)