Cosmetic change in MainWindow

[stefanhahmann]

The MainWindow layout appears a bit ugly in Linux environments. I suggest to make the window a bit wider to overcome this issue.

Before (Linux):

After (Linux):

Before (Windows):

After (Windows):

[tinevez]

Any chance we could use a smaller font size on linux instead?
My reasoning is that this window just has buttons. The text is nice but not so informative, so making room for it is not super great.
Also I would like to keep some width for later, as I would like to attach a side panel for logging.

[stefanhahmann]

Any chance we could use a smaller font size on linux instead? My reasoning is that this window just has buttons. The text is nice but not so informative, so making room for it is not super great. Also I would like to keep some width for later, as I would like to attach a side panel for logging.

I added a commit that changes the default font for unix/linux system. Since, I did not want to make that font smaller (since a smaller font looked ugly in Linux), I still had to increase the size of the MainWindow a bit (170), but less than in the first commit (where it was 190):

After PR (Linux):

After PR (Windows):