identify the game by its name in SDL

src/engine/client/ClientApplication.cpp

@@ -85,6 +85,20 @@ class ClientApplication : public Application {
             // Don't set this for TTY applications as they really aren't DPI aware. Let them scale.
             SDL_SetHint(SDL_HINT_WINDOWS_DPI_AWARENESS, "system");
 #endif
+
+#if defined(__linux__) && defined(BUILD_GRAPHICAL_CLIENT)
+            // identify the game by its name in certain
+            // volume control / power control applets,
+            // for example, the one found on KDE:
+            // "Unvanquished is currently blocking sleep."
+            // instead of "My SDL application ..."
+            // this feature was introduced in SDL 2.0.22
+            SDL_SetHint("SDL_APP_NAME", PRODUCT_NAME);
+            // SDL_hints.h: #define SDL_HINT_APP_NAME "SDL_APP_NAME"
+            // don't use the macro here, in case
+            // SDL doesn't use current headers.
+#endif
+
             Hunk_Init();
 
             Com_Init();