Internals: added IM_LIKELY(), IM_UNLIKELY() helper macros (yet unused). Added ImFontGetCharAdvanceX() macro.

Amend 88e23273
Use void* cast in backend where the memset are infrequent.

imgui_freetype: Fixed a crash in build font atlas when using merged fonts and the first font in a merged set has no loaded glyph. (#8081)

(Breaking) Removed pre-1.87 obsolete io.KeyMap[], io.KeysDown[], io.NavInputs[]. Remove IMGUI_DISABLE_OBSOLETE_KEYIO. (#4921)

Follow the refactors in #7925.

As supposedly they were for stb_textedit.h which is now moved to imgui_draw.cpp

Produced when memset(this, ..) is used on a non-trivially copyable type

Was harmless because TextA is always zero-terminated, and TextA.Size >= CurLenA + 1.

InputText: fixed a bug (regression in 1.91.2) where modifying text buffer within a callback would sometimes prevents further appending to the buffer. (#7925)

There's a confusion between TextA.Size and CurLenA we should be merging them.
Amend 19accb14

Buttons: using ImGuiItemFlags_ButtonRepeat makes default button behavior use PressedOnClick instead of PressedOnClickRelease when unspecified.

Fixed ClearOutputData() not clearing Used4kPagesMap (mostly harmless).

Backends: Win32: rework to add ImGui_ImplWin32_WndProcHandlerEx() not using current context (experimental). (#8069, #6293, #5856, #586)

+ GetIOEx(). Amend fedf45c7 + cba656a. Amend 416cfdb9.

Selectable, Style: selected Selectable() use _Header color instead of an arbitrary lerp between _Header and _HeaderHovered. (#8106, #1861)

Backends: SDL2: Replace SDL_Vulkan_GetDrawableSize() forward declaration with the actual include. (#8095, #7967, #3190)

Backends: SDL2, SDL3: SDL_EVENT_MOUSE_WHEEL event doesn't require dividing by 100.0f on Emscripten. (#4019, #6096, #1463)

Ref https://github.com/libsdl-org/SDL/issues/10454#issuecomment-2434187317

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