Topic on Skin talk:Metrolook

If mw.hook('wikipage.content') fires more than once by Javascript, it will be broken.

Steps to reproduce:

1. Open the debugger in your wiki by pressing Shift+Ctrl+I.
2. In the console, type mw.hook('wikipage.content').fire() and hit enter.
3. Click a header of the sidebar.
   -> The sidebar will be collapsed immediately after it is expanded.