| Window rectangles: Changed WorkRect to cover the whole region including scrolling (toward obsolete ContentsRegionRect) + using full WindowPadding*1 padding. Tweaked InnerClipRect. TreeNode, CollapsingHeader: Fixed highlight frame not covering horizontal area fully when using horizontal scrolling. (#2211, #2579) TabBar: Fixed BeginTabBar() within a window with horizontal scrolling from creating a feedback loop with the horizontal contents size. Columns: Fixed Columns() within a window with horizontal scrolling from not covering the full horizontal area (previously only worked with an explicit contents size). (#125) Demo: Added demo code to test contentsrect/workrect | 
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| docs/CHANGELOG.txt | 
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| imgui.cpp | 
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| imgui_demo.cpp | 
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| imgui_internal.h | 
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| imgui_widgets.cpp | 
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