feat(cpp/vendor): vendor ImGuiColorTextEdit (MIT) for text_editor primitive

Pinneado al commit 0a88824f del upstream. Patches locales aplicados a TextEditor.cpp para compilar contra ImGui 1.91+ (GetKeyIndex eliminado, PushAllowKeyboardFocus/PopAllowKeyboardFocus removidos). Documentado en cpp/vendor/imgui_text_edit/README.md. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-25 21:00:22 +02:00
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+# ImGuiColorTextEdit (vendored)
+
+Source: https://github.com/BalazsJako/ImGuiColorTextEdit
+License: MIT
+Pinned commit: `0a88824f7de8d0bd11d8419066caa7d3469395c4` (master HEAD at vendor time)
+
+Files:
+- `TextEditor.h`
+- `TextEditor.cpp`
+
+Used by `cpp/functions/core/text_editor.{h,cpp}` via PIMPL — the public API is in
+`namespace fn::` and the vendor's `TextEditor` type is hidden inside the .cpp.
+
+## Updating
+
+```bash
+cd cpp/vendor/imgui_text_edit
+curl -fL -O https://raw.githubusercontent.com/BalazsJako/ImGuiColorTextEdit/<commit>/TextEditor.h
+curl -fL -O https://raw.githubusercontent.com/BalazsJako/ImGuiColorTextEdit/<commit>/TextEditor.cpp
+# Update commit hash above.
+```
+
+## Notes / known issues
+
+- The vendor expects `imgui.h` and `imgui_internal.h` in the include path. Both are
+  provided by our vendored ImGui in `cpp/vendor/imgui/`.
+- `LanguageDefinition::GLSL()`, `SQL()`, `CPlusPlus()` are provided by the vendor and
+  consumed by our wrapper (`fn::CodeLang`).
+- `inotify` watcher limit on Linux — see `file_watcher_cpp_core.md`.
+
+## Local patches applied
+
+Upstream commit `0a88824f` predates several ImGui API removals (we vendor ImGui
+1.91+). The following minimal in-tree patches were applied to `TextEditor.cpp`:
+
+- `ImGui::GetKeyIndex(ImGuiKey_X)` -> `ImGuiKey_X` (the `ImGuiKey` enum is now a
+  direct, stable index — `GetKeyIndex` was removed).
+- `ImGui::PushAllowKeyboardFocus(true)` / `PopAllowKeyboardFocus()` -> removed
+  (replaced upstream by `SetItemKeyOwner` / `ImGuiItemFlags_AllowKeyboardFocus`,
+  but the editor functions correctly without them in our embedding).
+
+Re-apply when refreshing the vendor:
+
+```bash
+sed -i 's/ImGui::GetKeyIndex(\([^)]*\))/\1/g' TextEditor.cpp
+sed -i 's/ImGui::PushAllowKeyboardFocus(true);/\/\/ removed in ImGui 1.89+/g' TextEditor.cpp
+sed -i 's/ImGui::PopAllowKeyboardFocus();/\/\/ removed in ImGui 1.89+/g' TextEditor.cpp
+```