GL_MAJOR_VERSION and GL_MINOR_VERSION are available on GL 3.0 and above.
So we have to parse GL_VERSION under GL 2.x
Reference https://www.khronos.org/opengl/wiki/OpenGL_Context#Context_information_queries
Regressed since 459de654
See https://github.com/ocornut/imgui/pull/3530

ColorEdit, ColorPicker: Fixed hue/saturation preservation logic from interfering with the displayed value (but not stored value) of others widgets instances. (#6155)

Amend 30546bc0, accb0261, 38d22bc4

Namely for docking system.

Internals: Settings: added ClearWindowSettings(). Extract part of CreateNewWindow() into InitOrLoadWindowSettings().

Designed to that if the window reappear in the session it won't take an additional slot.

Internals: Settings: Added FindWindowSettingsByName() (replacing old version by ID) FindWindowSettingsByWindow() + remove unnecessary FindOrCreateWindowSettings().

In 1 code path we do a redundant hash but this happens only once per window per session so we are ok.

Backends: GLFW: Warning fix under Linux.

Backends: SDL2:+SDL3 Implement SetPlatformImeDataFn (amends). (#6071, #1953) + fix SDL3 setting PlatformHandleRaw. (#6146)

Backends: SDL3: update to run with SDL3. Examples: Add SDL3+Gl example. Remove some version checks. (#6146)

More update upcoming in docking branch.

Backends: SDL3: copied imgui_impl_sdl2 into imgui_impl_sdl3 and ONLY replaced strings (1/2). (#6146)

NO OTHER CHANGES. This WILL NOT compile with SDL3.
This intermediate commit designed to make it easier to visualize the meaningful channges commit in the next commit.

In particular:
- imgui.cpp : move UpdateInputEvents() higher in NewFrame() to match docking + update RenderMouseCursor() to match.
- imgui_draw.cpp: ImDrawList::_ResetForNewFrame() change from c807192a
- Backends: SDL2. Add MouseWindowID + change SDL_CaptureMouse() test to match docking branch. Not strictly necessary but aimed at reducing drift because we go on and fork this file.
+ moved responsability of checking valid names to TabBarGetTabName() to simplify both branches.

+ CI: Update Windows CI to update SDL 2.26.3 instead of 2.0.10

Examples: (Again, but better) made SDL+GL and GLFW+GL examples build with Emscripten. (#2492, #2494, #3699, #3705)

This reverts commit 96ab68ee.

# Conflicts:
#	docs/CHANGELOG.txt
#	examples/example_glfw_opengl3/main.cpp
#	examples/example_sdl_opengl3/main.cpp

Tables: Solved an ID conflict issue with multiple-instances of a same table. Storing instance id for convenience. (#6140)

TableGetColumnResizeID() are still using an incorrect table, but having only one-level left tends to cancel things out.

Backends: GLFW: Registering custom low-level mouse wheel handler to get more accurate scrolling impulses on Emscripten. (#4019, #6096)

Namely, GLFW JS emulation seems to quantize values to a min of -1/+1 which breaks modern OSX/Windows emulating smoothness with stepping wheels (slow steps are sending sub-1.0 values)
+ Massage changelog.

Backends:  Added support for SDL 2.0.18+ preciseX/preciseY mouse wheel data for smooth scrolling + scaling for Emscripten. (#4019, #6096)

+ Missing changelog entries.

Latest version seems ok.

Examples: Made example_sdl_opengl3 and example_glfw_opengl3 build with Emscripten. Removed dedicated examples. (#2492, #2494, #3699, #3705)

Examples: refactor all examples with a MainLoopStep() function, to facilitate use with Emscripten. (#2492, #3699)

Aligned all examples.

Examples: Emscripten+GLFW: revert to use a shell_minimal.html closer to vanilla one, as our fullscreen + misc tweaks to Emscripten+SDL example to match other version.

+ Fix warnings.

Backends, Inputs: Made horizontal scroll wheel and horizontal scroll direction consistent accross backends/os. (#4019, #6096, #1463)

Documented assumptions.

Backends: OSX: Fixed scroll wheel scaling for devices emitting events with hasPreciseScrollingDeltas==false (e.g. non-Apple mices).

Ref #4019 for details provided in .XLS sheet, although not strictly related to main issue topic.
+ Rename Emscripten demo titles to make SDL visible.

Examples: SDL+SDL_Renderer: Added call to SDL_RenderSetScale() to display is correct on a Retina display (albeit lower-res as our other unmodified examples). (#6121, #6065, #5931).

Text: fixed issue in RenderText() leading to IM_ASSERT_PARANOID() triggering if enabled. (#6132, #5720, #5919)

Amend 3482d4ec, bd96f6ea

Amend a5e93921