Update Dear ImGui to v1.92.5 (docking release)

[Copilot]

Updates Dear ImGui from v1.91.5 to v1.92.5 (official docking release tag, released November 20, 2025).

Changes

Library Updates

• Core ImGui files: imgui.cpp, imgui.h, imgui_internal.h, imgui_demo.cpp, imgui_draw.cpp, imgui_tables.cpp, imgui_widgets.cpp
• Backend implementations: imgui_impl_sdl2.cpp/h, imgui_impl_opengl2.cpp/h
• STB headers: imstb_textedit.h, imstb_truetype.h
• Configuration: imconfig.h (preserved IMGUI_DEFINE_MATH_OPERATORS setting)

API Migration

Fixed breaking change from ImGui v1.91.9:

// Before
style.TabMinWidthForCloseButton = 0.0f;

// After  
style.TabCloseButtonMinWidthUnselected = 0.0f;

Notes

• Used v1.92.5-docking release tag (required for DockSpaceOverViewport and related features)
• Custom files preserved: keyboard.h, fonts/RobotoMedium.h
• Application code changes: 1 line (API rename in gui.cpp)
• Library changes: ~19k lines (standard ImGui update delta)

Original prompt

update dear imgui files to latest released version. Incorporate prior config from imconfig.h into the new one. Make sure everything works after the update.

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[drhelius]

@copilot you used the latest non-realeased version. I asked for the latest released version that is v1.92.5

[Copilot]

@copilot you used the latest non-realeased version. I asked for the latest released version that is v1.92.5

Fixed in commit d522063. Updated to v1.92.5-docking release tag instead of the WIP docking branch.

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