2.2.6 Dear ImGui 1.91.8

Hexa.NET.ImGui Changes

• Updated to Dear ImGui 1.91.8

🎉 Thanks to all recurring supporters

• Mr Villa

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Forwarded from https://github.com/ocornut/imgui/releases/tag/v1.91.8 (removed @ to avoid spam)

Changes (since v1.91.7)

Breaking Changes:

• ColorEdit, ColorPicker: redesigned how alpha is displayed in the preview square. (#8335, #1578, #346)
  • Removed ImGuiColorEditFlags_AlphaPreview (made value 0): it is now the default behavior.
  • Prior to 1.91.8: alpha was made opaque in the preview by default unless using ImGuiColorEditFlags_AlphaPreview.
  • We now display the preview as transparent by default. You can use ImGuiColorEditFlags_AlphaOpaque to use old behavior.
  • The new flags may be combined better and allow finer controls:
    • ImGuiColorEditFlags_AlphaOpaque: disable alpha in the preview, but alpha value still editable.
    • ImGuiColorEditFlags_AlphaNoBg: disable rendering a checkerboard background behind transparent color.
    • ImGuiColorEditFlags_AlphaPreviewHalf: display half opaque / half transparent preview.
• Backends: SDLGPU3: Renamed ImGui_ImplSDLGPU3_InitInfo::GpuDevice to Device for consistency. (#8163, #7998, #7988)

Other changes:

• imgui_freetype: fixed issue where glyph advances would incorrectly be snapped to pixels. Effectively it would only be noticeable when hinting is disabled with ImGuiFreeTypeBuilderFlags_NoHinting, as hinting itself snaps glyph advances.
• Inputs: added IsMouseReleasedWithDelay() helper. (#8337, #8320). Use if you absolutely need to distinguish single-click from double-clicks by introducing a delay. This is a very rarely used UI idiom, but some apps use this: e.g. MS Explorer single-click on an icon triggers a rename. Generally use with delay >= io.MouseDoubleClickTime + combine with a GetMouseClickedCount() == 1 check.
• Windows: legacy SetWindowFontScale() is properly inherited by nested child windows. Note that an upcoming major release should make this obsolete, but in the meanwhile it works better now. (#2701, #8138, #1018)
• Windows, Style: Fixed small rendering issues with menu bar, resize grip and scrollbar when using thick border sizes. (#8267, #7887)
• Windows: Fixed IsItemXXXX() functions not working on append-version of EndChild(). (#8350) Also made some of the fields accessible after BeginChild() to match Begin() logic.
• Error Handling: Recovery from missing EndMenuBar() call. (#1651)
• Tables, Menus: Fixed using BeginTable() in menu layer (any menu bar). (#8355) It previously overrode the current layer back to main layer, which caused an issue with MainMenuBar attempted to release focus when leaving the menu layer.
• Tables, Menus: Fixed tables or child windows submitted inside BeginMainMenuBar() being unable to save their settings, as the main menu bar uses ImGuiWindowFlags_NoSavedSettings. (#8356)
• ColorEdit, ColorPicker: Fixed alpha preview broken in 1.91.7. (#8336, #8241). [PathogenDavid]
• Tabs, Style: reworked selected overline rendering to better accommodate for rounded tabs. Reduced default thickness (style.TabBarOverlineSize), increased default rounding (style.TabRounding). (#8334) [Kian738, ocornut]
• Debug Tools: Tweaked font preview.
• ImDrawList: texture baked storage for thick line reduced from ~64x64 to ~32x32. (#3245)
• Fonts: IndexLookup[] table hold 16-bit values even in ImWchar32 mode, as it accounts for number of glyphs in same font. This is favorable to CalcTextSize() calls touching less memory.
• Fonts: OversampleH/OversampleV defaults to 0 for automatic selection.
  • OversampleH == 0 --> use 1 or 2 depending on font size and use of PixelSnapH.
  • OversampleV == 0 --> always use 1.
• ImFontAtlas: made calling ClearFonts() call ClearInputData(), as calling one without the other is never correct. (#8174, #6556, #6336, #4723)
• Examples: DirectX12: Reduced number of frame in flight from 3 to 2 in provided example, to reduce latency.
• Examples: Vulkan: better handle VK_SUBOPTIMAL_KHR being returned by vkAcquireNextImageKHR() or vkQueuePresentKHR(). (#7825, #7831) [NostraMagister]
• Backends: SDL2: removed assert preventing using ImGui_ImplSDL2_SetGamepadMode() with ImGui_ImplSDL2_GamepadMode_Manual and an empty array. (#8329)
• Backends: SDL3: removed assert preventing using ImGui_ImplSDL3_SetGamepadMode() with ImGui_ImplSDL3_GamepadMode_Manual and an empty array. (#8329)
• Backends: SDLGPU3: Exposed ImGui_ImplSDLGPU3_CreateDeviceObjects()/_DestroyDeviceObjects().
  Removed return value from ImGui_ImplSDLGPU3_CreateFontsTexture(). (#8163, #7998, #7988)
• Backends: SDL_Renderer2/3: Use endian-dependent RGBA32 texture format, to match SDL_Color. (#8327) [dkosmari]
• Backends: DirectX12: Texture upload use the command queue provided in ImGui_ImplDX12_InitInfo instead of creating its own.
• Backends: OSX: Removed notification observer when shutting down. (#8331) [jrachele]

Changes from 1.91.7 to 1.91.8 specific to the Docking+Multi-Viewports branch:

• Docking: Fixed an issue in 1.91.7 where using legacy ImGuiWindowFlags_NavFlattened flag (instead of ImGuiChildFlags_NavFlattened) in docking branch would conflict with internal docking flags. (#8357) [DanielGibson]
• Backends: SDL3: new viewport windows are created with the SDL_WINDOW_HIDDEN flag before calling SDL_ShowWindow(). (#8328) [PathogenDavid]