Push a clipping rectangle for both ImGui logic (hit-testing etc.) and low-level ImDrawList rendering. - When using this function it is sane to ensure that float are perfectly rounded to integer values, so that e.g. (int)(max.x-min.x) in user's render produce correct result. - If the code here changes, may need to update code of functions like NextColumn() and PushColumnClipRect(): some frequently
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