Prevent forwarding only mouse UP events

Some mouse clicks DOWN are captured for shortcuts, but the matching UP
event was still forwarded to the device.

Instead, capture both DOWN and UP for shortcuts, and do nothing on UP.

app/src/input_manager.c

@@ -646,13 +646,17 @@ input_manager_process_mouse_button(struct input_manager *im,
     }
 
     bool down = event->type == SDL_MOUSEBUTTONDOWN;
-    if (!im->forward_all_clicks && down) {
+    if (!im->forward_all_clicks) {
         if (control && event->button == SDL_BUTTON_RIGHT) {
-            press_back_or_turn_screen_on(im->controller);
+            if (down) {
+                press_back_or_turn_screen_on(im->controller);
+            }
             return;
         }
         if (control && event->button == SDL_BUTTON_MIDDLE) {
-            action_home(im->controller, ACTION_DOWN | ACTION_UP);
+            if (down) {
+                action_home(im->controller, ACTION_DOWN | ACTION_UP);
+            }
             return;
         }
 
@@ -665,7 +669,9 @@ input_manager_process_mouse_button(struct input_manager *im,
             bool outside = x < r->x || x >= r->x + r->w
                         || y < r->y || y >= r->y + r->h;
             if (outside) {
-                screen_resize_to_fit(im->screen);
+                if (down) {
+                    screen_resize_to_fit(im->screen);
+                }
                 return;
             }
         }