I currently see two international keyboard issues: - French Keyboard and Backend SDL2 - Several keys are not checkable with IsKeyDown - Wrong ImGuiKey keydown

I currently see two international keyboard issues: - French Keyboard and Backend SDL2 - Several keys are not checkable with IsKeyDown - Wrong ImGuiKey keydown indexes reported from Win32 backend for some keys when using UK keyboard with UK keyboard layout There are also 2 issues with IME: - Marked Text / SDL_TEXTEDITING Event / IME Composition support - Backspace handling by text widget in default Windows IME environment.