Higher DPI above 100% causes some wonkyness with all theme elements. When using higher DPI, any images that have sizing margins should stretch like how they do with the default windows ones. various controls, frames etc... all look super blurry. I should not need to provide Higher DPI images for them. Can you guys look into this issue.
WindowBlinds is working as designed.
If it worked as suggested you would end up with 1 pixel lines basically turning into nothing on high dpi displays.
Images are first upscaled to the current dpi along with the margins and then painted using those.
You should be providing high dpi versions of images if you want control over them, otherwise WB's job is to make the skin look like it would if the screen were running at a lower resolution at normal dpi. To not do this would render most themes unusable especially any glyphs which would be tiny, titlebars would be physically tiny (1/4 size at 200%) etc.