ImDrawList: Large text passed to AddText() are being scanned for their end in order to avoid pre-reserving too many vertices.

ImDrawList: Fixed clipping of leading lines above the clipping rectangle from counting in the worst case vertices reservation. (fix code added in #200!)

Internals: InputText: Renaming. Comments.

InputText: Renamed ImGuiTextEditCallback to ImGuiInputTextCallback, ImGuiTextEditCallbackData to ImGuiInputTextCallbackData for consistency. Kept redirection types (will obsolete).

InputText: Added support for buffer size/capacity changes via the ImGuiInputTextFlags_CallbackResize flag. (#2006, #1443, #1008).

InputText: Internal renaming of some fields + final copy uses edit_state.CurLenA+1 instead of buf_size.

InputText: Fixed minor off-by-one issue when submitting a buffer size smaller than the initial zero-terminated buffer contents.

InputText: (Breaking change) removed ImGuiTextEditCallbackData::ReadOnly since it is a duplication of (ImGuiTextEditCallbackData::Flags & ImGuiInputTextFlags_ReadOnly) (#211)

Added IMGUI_VERSION_NUM for easy compile-time testing. (#2025)

Added links to Discourse forums.

Internals: Moved code out of SliderBehaviorT to reduce code bloat and also because caller may have use for the grab_bb for styling purposes.

Update README.md

Internals: Added ImTextCountUtf8BytesFromChar() helper.

SplitterBehavior: Fix for when the sizes are already under the minimum desired size.

Fixed assertion when transitioning from an active ID to another within a group, affecting ColorPicker (broken in 1.62). Made ActiveIdIsAlive track the actual ID to avoid incorrect polling in BeginGroup/EndGroup when the ID changes within the group. (#2023, #820, #956, #1875).

Metrics: Added io.MetricsActiveAllocations, moving away from the cross-context global counters than we previously used. (#1565, #1599, #586)

Selectable: Added ImGuiSelectableFlags_Disabled flag in the public API. (#211)

Nav: NavWindowingList doesn't save to .ini file. TODO entries.

TODO + added missing _None enum for some internals flags.

Internals: Extracted RenderMouseCursor() out of EndFrame(). Moved to imgui_draw.cpp along with RenderArrowPointingAt(). Comments. (#2013)

Examples: Cast to ImTextureID instead of void* when assigning to TexId. Applied to all examples. (#2015)

imgui_impl_dx12: Cast to ImTextureID instead of void* to enable redefinition of ImTextureID (#2015, #301)

imgui_impl_opengl3: Advertised as a ES2/ES3 renderer. Defaults to ES3 on Android. Default on "#version 300 es" on ES 3. (#2002, #1873)

imgui_impl_win32: Don't redefine WIN32_LEAN_AND_MEAN if already defined (#2014)

Examples: Fix 'How to build' instructions for SDL2 examples (#2012)

imgui_impl_opengl3.cpp Using GLES3 on IOS instead of gl3w. (#2002, #1873) ...

Not modifying the main.cpp yet because we need to test GL ES 3 context creation on iOS (only imgui_impl_opengl3.cpp was tested).

Nav: Made CTRL+TAB skip menus + skip the current navigation window if is has the ImGuiWindow_NoNavFocus set. (#787) ...

While it was previously possible, you won't be able to CTRL-TAB out and immediately back in a window with the ImGuiWindow_NoNavFocus flag.

Use literals in place of LLONG_MIN, LLONG_MAX ULLONG_MAX if they are not available. Amend 498c0dc. We prefer using the defines if available in limits.h because they somehow tend to work without warnings when enabling strict C++03 compilation. The 3 literals are fallbacks.. (#1926).

Internals: Minor renaming for consistency.

Update to Contributing, and Issue/PR templates.