InputText: Fixed not tracking the cursor horizontally When modifying the text buffer through a callback.

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

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.

Merge branch 'master' into viewport

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)

Viewport: DestroyPlatformWindows() checks for the bool CreatedPlatformWindow flag correctly. Note that we set CreatedPlatformWindow=true for the main viewport to allow the back-end to store data in the public Viewport structure (for consistency). (#1542)

Viewport: Initial viewport DpiScale only queried on viewport creation. Because AddUpdateViewport() is called repeatedly on MovingWindow or with ImGuiConfigFlags_ViewportsNoMerge, the DpiScale update would break ImGuiConfigFlags_DpiEnableScaleViewports. (#1542)

Viewport: ImGuiWindowFlags_NoFocusOnAppearing affects viewport accordingly. (#1542)

Merge branch 'master' into viewport ...

# Conflicts:
#	examples/imgui_impl_opengl2.cpp
#	examples/imgui_impl_opengl3.cpp
#	imgui.cpp

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

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_opengl3: Advertised as a ES2/ES3 renderer. Defaults to ES3 on Android. Default on "#version 300 es" on ES 3. (#2002, #1873)

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.

Metrics: Changed io.MetricsActiveWindows to reflect the number of active windows (!= from visible windows), which is useful for lazy/idle render mechanisms as new windows are typically not visible for one frame. ...

Metrics: Added io.MetricsRenderWindow to reflect the number of visible windows.

Using limits.h LLONG_MIN etc. to increase old-compiler compatibility (as ll and ull prefixes were not standard). Not tested much on old compilers, relying on Clang/GCC warnings.

Merge branch 'master' into viewport ...

# Conflicts:
#	examples/imgui_impl_dx11.cpp
#	examples/imgui_impl_glfw.cpp
#	examples/imgui_impl_sdl.cpp
#	imgui.cpp