Dynamically allocate long text for SDL_EVENT_TEXT_INPUT events

This prevents input text from being split across Unicode combining or modifier characters, and in practice allocations will rarely happen.

test/checkkeys.c

@@ -186,6 +186,7 @@ static void loop(void)
         case SDL_EVENT_TEXT_INPUT:
             PrintText("INPUT", event.text.text);
             SDLTest_TextWindowAddText(textwin, "%s", event.text.text);
+            SDL_CleanupEvent(&event);
             break;
         case SDL_EVENT_FINGER_DOWN:
             if (SDL_TextInputActive()) {

test/checkkeysthreads.c

@@ -187,6 +187,7 @@ static void loop(void)
             break;
         case SDL_EVENT_TEXT_INPUT:
             PrintText("INPUT", event.text.text);
+            SDL_CleanupEvent(&event);
             break;
         case SDL_EVENT_MOUSE_BUTTON_DOWN:
             /* Left button quits the app, other buttons toggles text input */

test/testcontroller.c

@@ -1728,6 +1728,7 @@ static void loop(void *arg)
                     AddControllerNameText(event.text.text);
                 }
             }
+            SDL_CleanupEvent(&event);
             break;
         case SDL_EVENT_QUIT:
             done = SDL_TRUE;

test/testime.c

@@ -770,6 +770,7 @@ int main(int argc, char *argv[])
                 /* is committed */
                 markedText[0] = 0;
                 Redraw();
+                SDL_CleanupEvent(&event);
                 break;
 
             case SDL_EVENT_TEXT_EDITING: