checkkeys: enable showing IME candidates

test/checkkeys.c

@@ -307,6 +307,7 @@ static void loop(void)
 int main(int argc, char *argv[])
 {
     int w, h;
+    SDL_Rect input_rect;
 
     SDL_SetHint(SDL_HINT_WINDOWS_RAW_KEYBOARD, "1");
 
@@ -347,6 +348,16 @@ int main(int argc, char *argv[])
     }
 #endif
 
+    /* Enable showing IME candidates */
+    SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
+
+    /* Set an input rectangle in the center of the window */
+    input_rect.x = w / 4;
+    input_rect.y = h / 4;
+    input_rect.w = w / 2;
+    input_rect.h = h / 2;
+    SDL_SetTextInputRect(&input_rect);
+
     SDL_StartTextInput();
 
     /* Print initial state */