Manual size for windowed mode

[supertuxkart-sourceforge-migration]

Author: auria

MiniBjorn :

Being able to pick any X*Y size for windowed mode would be nice, so it can be adjusted to space left by other windows or whatever other preference one wants. It would also allow testing exotic resolutions not know by current system, but avaliable in others, to check how things fit or is they look too squashed.

Migrated-From: https://sourceforge.net/apps/trac/supertuxkart/ticket/9

[supertuxkart-sourceforge-migration]

Author: hikerstk
I can't see a reason to have this (since we have a command line option for doing this), but auria loves it so much, so we will leave it in ... for later.

[hiker]

Command line options should be good enough, since I can only see testing as a good use case. No one is adjusting screen size depending on how much space is left.

[deveee]

Some people play games in windowed mode with maximized window... In this
case real window size is smaller than display resolution.

And it is comfortable when you can resize window in all directions and set
any size you want.