Add resize grips for child windows #8501
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If a child window has both the
ImGuiChildFlags_ResizeXandImGuiChildFlags_ResizeYflags set, it should get a resize grip like a normal window, so that it can be resized in both directions at the same time.The code that clamps the resizing of childs within their parents is moved to
CalcResizePosSizeFromAnyCorner(), so that it also occurs when the child is resized from the grip. The only two call-sites to this function are inUpdateWindowManualResize(), that is when resizing from a grip and when resizing from a border.