Backends: Fixed zealous warnings.

backends/imgui_impl_sdl2.cpp

@@ -192,7 +192,6 @@ static void ImGui_ImplSDL2_PlatformSetImeData(ImGuiContext*, ImGuiViewport*, ImG
 ImGuiKey ImGui_ImplSDL2_KeyEventToImGuiKey(SDL_Keycode keycode, SDL_Scancode scancode);
 ImGuiKey ImGui_ImplSDL2_KeyEventToImGuiKey(SDL_Keycode keycode, SDL_Scancode scancode)
 {
-    IM_UNUSED(scancode);
     switch (keycode)
     {
         case SDLK_TAB: return ImGuiKey_Tab;
@@ -332,6 +331,7 @@ ImGuiKey ImGui_ImplSDL2_KeyEventToImGuiKey(SDL_Keycode keycode, SDL_Scancode sca
     case SDL_SCANCODE_COMMA: return ImGuiKey_Comma;
     case SDL_SCANCODE_PERIOD: return ImGuiKey_Period;
     case SDL_SCANCODE_SLASH: return ImGuiKey_Slash;
+    default: break;
     }
     return ImGuiKey_None;
 }

backends/imgui_impl_sdl3.cpp

@@ -313,6 +313,7 @@ ImGuiKey ImGui_ImplSDL3_KeyEventToImGuiKey(SDL_Keycode keycode, SDL_Scancode sca
     case SDL_SCANCODE_COMMA: return ImGuiKey_Comma;
     case SDL_SCANCODE_PERIOD: return ImGuiKey_Period;
     case SDL_SCANCODE_SLASH: return ImGuiKey_Slash;
+    default: break;
     }
     return ImGuiKey_None;
 }