Merge branch 'master' into docking

# Conflicts:
#	examples/imgui_impl_opengl3.cpp
#	imgui.cpp

docs/CHANGELOG.txt

@@ -105,6 +105,9 @@ Other changes:
 
 Breaking Changes:
 
+- Removed unncessary ID (first arg) of ImFontAtlas::AddCustomRectRegular() function. Please
+  note that this is a Beta api and will likely be reworked to support multi-monitor multi-DPI.
+
 Other Changes:
 
 - TreeNode: Fixed bug where BeginDragDropSource() failed when the _OpenOnDoubleClick flag is
@@ -112,7 +115,18 @@ Other Changes:
   flag was also set, and _OpenOnArrow is frequently set along with _OpenOnDoubleClick).
 - TreeNode: Fixed bug where dragging a payload over a TreeNode() with either _OpenOnDoubleClick
   or _OpenOnArrow would open the node. (#143)
+- Style: Added style.TabMinWidthForUnselectedCloseButton settings.
+  Set to 0.0f (default) to always make a close button appear on hover (same as Chrome, VS).
+  Set to FLT_MAX to only display a close button when selected (merely hovering is not enough).
+  Set to an intermediary value to toggle behavior based on width (same as Firefox).
 - Backends: Win32: Support for #define NOGDI, won't try to call GetDeviceCaps(). (#3137, #2327)
+- Backends: OpenGL: Fixed handling of GL 4.5+ glClipControl(GL_UPPER_LEFT) by inverting the
+  projection matrix top and bottom values. (#3143, #3146) [@u3shit]
+- Backends: Vulkan: Fixed error in if initial frame has no vertices. (#3177)
+- Backends: Vulkan: Fixed edge case where render callbacks wouldn't be called if the ImDrawData 
+  structure didn't have any vertices. (#2697) [@kudaba]
+- Drag and Drop: Fixed unintended fallback "..." tooltip display during drag operation when
+  drag source uses _SourceNoPreviewTooltip flags. (#3160) [@rokups]
 
 
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