Window BG not scaling correctly

[Sebanisu]

The larger windows will have thicker borders and extra stretched out background.

Smaller windows will have thin borders and extra squished out background.

wip
https://cdn.discordapp.com/attachments/552838120895283210/570316400732668027/unknown.png

[Sebanisu]

I forgot i had a scale value to set. if you leave scale to 0 it auto detects the scale. Once I set all the pieces to the same scale value. They all had the same size borders and bg. Then I needed to check for textures going out of the desired dst rectangle or not filling it.

Sebanisu@d48d023
end result

I did just see a small defect on the top right corner of one of the boxes. Might be a rounding error from converting from float to int without round. I'll check it out.

Found the problem and fixed it