Make panel wider to show longer page and artboard names

[jerryjappinen]

The window often looks like the attached pic, i.e. most page and artboard names are cut off in a large document with a lot of nested symbols.

The best fix would probably be to make the window resizable and remember the user preference, but as a simple fix the window could be at least a little bit wider. Maybe the window would also work better with short names if the thumbnail were on the left?

[jazzybeat]

We should consider removing the preview window to improve performance.

Suggested design