next: Fixed display issues

[zsalch]

Issue #395
Base on #378 #384

It can support portrait mode, although it is not perfect, but it works.
In the portrait mode, the layout remains to be discussed, but I think it can help the current display.
Also fixed some display issues, when the user feels free to change the window size.

[AncalagonX]

If possible, it would be nice to make this a user-configurable setting to have it display above or below the board.

[OlivierBlanvillain]

I'm not really a fan of this solution as is doesn't fully solves the problem: people want to customize the layout. What about using something like JToolBar? It seems like think can be moved around inside the main windows or even detached.

[zsalch]

I agree that this is just a transitional solution.
The best solution is that each panel can be customized, blended or separated.
It seems that JToolBar can implement, which may be the next goal.

[OlivierBlanvillain]

I agree that this is just a transitional solution.

Then I would be for postponing this PR until we have a definitive solution...

[zsalch]

I no longer use this as a portrait mode solution, but just to solve some display issue, so I have changed the title.
Or I should close this, then wait for #402 to merge and re-open a PR that fixes the display issues.