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So say you usually play GZDoom Full Screen in 1920x1080 resolution, but this time you want to start up GZDoom windowed and in 1600x900 resolution; without the hassle of going into the options to set that manually.
At the moment, we can start windowed on the welcome prompt, but we can't set the resolution of the window without starting the game itself and fiddling in the options menu
So why not remove the middleman and add a little dropdown menu for to pick a resolution?

This is gonna get a [No] isn't it

Add the following to other command line options for GZDoom:

I really don't think the original suggestion as suggested is going to happen without a revamp of the video resolution code, which has been in dire need of a revamp for a long time now anyhow...

I won't [No] it, but if Graf doesn't, it's definitely being tossed into "On Hold".

Adding two comboboxes to the IWAD selector really can't be that hard, it's pretty isolated stuff that won't interfere with anything. All it needs to do is simulate -width and -height.

This isn't high priority,though.

Regarding the video init code, I don't think anything may happen here before the DirectDraw code isn't flushed for good. This is genuine legacy Windows madness which dictated how all this was written.