fix: cancel completion on update in automatic completion mode

If completion is automatically triggered (the default), then it also makes
sense to automatically cancel completions in situations where a completion
update would be required and we are *not* expected to automatically
re-trigger.

src/tui/editor.zig

@@ -4995,6 +4995,15 @@ pub const Editor = struct {
         _ = self.pop_tabstop();
     }
 
+    pub fn get_last_trigger_char(self: *Self) ?u8 {
+        const root = self.buf_root() catch return null;
+        var cursor = self.get_primary().cursor;
+        cursor.move_left(root, self.metrics) catch return null;
+        const egc, _, _ = cursor.egc_at(root, self.metrics) catch return null;
+        const char = if (egc.len == 1) egc[0] else return null;
+        return if (self.is_event_trigger(char, .insert)) char else null;
+    }
+
     fn is_completion_boundary_left(root: Buffer.Root, cursor: *const Cursor, metrics: Buffer.Metrics, triggers: []const TriggerSymbol) bool {
         if (cursor.col == 0) return true;
         var next = cursor.*;
@@ -6576,6 +6585,11 @@ pub const Editor = struct {
         };
     }
 
+    pub fn is_event_trigger(self: *Self, char: u8, event: TriggerEvent) bool {
+        for (self.get_event_triggers(event).items) |item| if (item.char == char) return true;
+        return false;
+    }
+
     fn clear_event_triggers(self: *Self) void {
         self.insert_triggers.deinit(self.allocator);
         self.delete_triggers.deinit(self.allocator);

src/tui/mode/overlay/completion_dropdown.zig

@@ -381,6 +381,9 @@ const cmds = struct {
     const Result = command.Result;
 
     pub fn update_completion(self: *Type, _: Ctx) Result {
+        if (tui.config().completion_trigger == .automatic and self.value.editor.get_last_trigger_char() == null)
+            return tp.self_pid().send(.{ "cmd", "palette_menu_cancel" }) catch |e| self.logger.err(module_name, e);
+
         clear_entries(self);
         self.longest_hint = try load_entries(self);
         try update_query_text(self, self.value.editor.get_primary().cursor);