Examples: Vulkan: Avoid unreferenced parameter warning. (#2162)

Internals: Moved the FocusableItemUnregister() outside of InputScalarAsWidgetReplacement(), it should not be here and doesn't facilitate reusing InputScalarAsWidgetReplacement(). (cc #2155)

gladLoadGL() return 0 to indicate failure (#2157)

Merge branch 'viewport' into docking ...

# Conflicts:
#	imgui_demo.cpp

Docking: Tweaked tooltip on tabs so they don't show immediately when holding and releasing a tab (using HoveredIdNotActiveTimer) + Minor refactor + Removed legacy .ini parsing.

Merge branch 'master' into viewport ...

# Conflicts:
#	imgui.cpp

Demo: Removed one level of indentation in the ShowDemoWindowXXX functions (6 kb worth of spaces!). Will break some merge/PR.

Demo: Split the contents of ShowDemoWindow() into smaller functions as it appears to speed up link time with VS. (#2152)

SliderAngle: Added optional `format` argument to allow users customize precision and make localization. (#2150)

Fixed OpenGL texture loading example in comment + Discourse link to root of discourse

Misc comments improvements

Comments in demo and opengl code + Internals: Added HoveredIdNotActiveTimer tracking hovering time unless the item is active, which is a commonly useful pattern.

Added DockSpaceOverViewport() call, not sure about this because of the menu bar limitation. (#2109)

Docking: Fixed not saving .ini file correct if DockingEnable flag is cleared. (#2109)

Viewport, Docking: Fixed incorrectly setting the ImGuiViewportFlags_NoInputs flag, affecting split docking node. (#2109)

Viewport, Docking: Fixed incorrectly setting the ImGuiViewportFlags_NoInputs flag, affecting split docking node. (#2109)

Font readme: Added OpenFontIcons, tweaks, links, removed spaces (#2141)

Merge branch 'viewport' into docking ...

# Conflicts:
#	imgui.cpp
#	imgui.h

Merge branch 'master' into viewport ...

# Conflicts:
#	imgui.cpp
#	imgui.h

Examples: SDL: Fixed usage of SDL_GetDisplayDPI (#2137, #1676)

Update README.md

Examples: Downgraded Xcode project object version (50->48) to support Xcode 9.2 (last version supported on macOS 10.12) (#2133, #1929)

Removed unnecessary ImGui:: qualifiers in internal code.

Examples: Downgraded Xcode project object version (50->48) to support Xcode 9.2 (last version supported on macOS 10.12) (#2133)

Demo: Added comments / tweaks related to the popups.

Added ImGuiWindowFlags_NoMouseInputs which is basically the old ImGuiWindowFlags_NoInputs (essentially we have renamed ImGuiWindowFlags_NoInputs to ImGuiWindowFlags_NoMouseInputs). Made the new ImGuiWindowFlags_NoInputs encompass both NoMouseInputs+NoNav, which is consistent with its description. (#1660, #787)

Window: Added ImGuiWindowFlags_NoBackground flag for consistency and to ease creating new flag combinations. Added ImGuiWindowFlags_NoDecoration helper flag which is essentially NoTitleBar+NoResize+NoScrollbar+NoCollapse. (#1660)

Viewport: Exposed GetOverlayDrawList(ImGuiViewport* viewport) in public API. (#1542, #1660, #1878, etc.)

Demo: Testing return value of BeginTabBar() for consistency.

Fix Clang/GCC's null-conversion warning: (#2081) ...

The warning is "implicit conversion of NULL constant to 'unsigned int' [-Wnull-conversion]". Happens when ImTextureID is not a void*, but unsigned int, for example.