setting border_width = 0 does not make border disappear. it still is about 1px thick. setting border color to transparent makes it invisible, but border still has the volume.

It's by design. So use 0 for alpha

i see. it creates some problems when mouse is passing over the border. so what happens when mouse passes over the border? what will be value of Gui.msLit() ? GuiObj* that border belongs to?

What kind of problems?

nothing engine related. i am integrating 3rd party library that requires forwarding input to it. whenever mouse goes over the border some unwanted behavior happens. if mouse skips the border then everything is fine.

Moving mouse exactly at border should set mslit to it's object or what's behind it

so which is it? i assume object is not picked up randomly so there should be a definitive answer.

that depends of floating point precision, I haven't tested it

i see. about 'by design' part... dont you think that it is more logical to not draw any border if width is null? or is there a technical difficulty that would prevent non-existent borders (i cant think why there should be)?

0 is special case, because it doesn't use dx9 tri/rect for drawing borders, but dx9 lines, which always force width of 1 pixel

why draw borders at all when width is 0?