Pausing the emulator, including using the Pause key, now also releases mouse capture, closes #2293.

src/qt/qt_platform.cpp

@@ -336,11 +336,15 @@ plat_pause(int p)
 #endif
         return;
     }
+
     if ((p == 0) && (time_sync & TIME_SYNC_ENABLED))
         nvr_time_sync();
 
     dopause = p;
     if (p) {
+	if (mouse_capture)
+		plat_mouse_capture(0);
+
         wcsncpy(oldtitle, ui_window_title(NULL), sizeof_w(oldtitle) - 1);
         wcscpy(title, oldtitle);
         paused_msg[QObject::tr(" - PAUSED").toWCharArray(paused_msg)] = 0;