event: Refactor async event processing

- Improve the implementation of deferred/immediate events.
- Use the new queue module to change how/when events are queued/processed by
  giving a private queue to each emitter.
- Immediate events(which only exist to break uv_run recursion) are now
  represented in the `loop->fast_events` queue.
- Events pushed to child queues are propagated to the event loop main queue and
  processed as K_EVENT keys.

1 files changed, 3 insertions, 11 deletions

diff --git a/src/nvim/ui.c b/src/nvim/ui.c
index 7e155f9b4f..ad875367c9 100644
--- a/src/nvim/ui.c
+++ b/src/nvim/ui.c
@@ -214,9 +214,9 @@ void ui_detach(UI *ui)
     shift_index++;
   }
 
-  ui_count--;
-  // schedule a refresh
-  loop_push_event(&loop, (Event) { .handler = refresh }, false);
+  if (--ui_count) {
+    ui_refresh();
+  }
 }
 
 void ui_clear(void)
@@ -485,11 +485,3 @@ static void ui_mode_change(void)
   UI_CALL(mode_change, mode);
   conceal_check_cursur_line();
 }
-
-static void refresh(Event event)
-{
-  if (ui_count) {
-    ui_refresh();
-  }
-}
-