Viewport: Fix setting window size on macos (glfw). #2767
Merged
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MacOS positions windows by their bottom-left corner why the rest of the world (including imgui) position windows by the top-left corner. This created an issue where collapsing imgui window would cause window header to remain at the bottom the full window rect. Likewise resizing window by using sizing handle caused window to grow upwards when we tried to expand window downwards.
This workaround moves window to the opposite direction by the delta of size change creating an illusion that windows are positioned by their top-left corner.