Bucket fill will now incrementally process the queue on preview mode

editor/plugins/tile_map_editor_plugin.cpp

@@ -39,6 +39,14 @@ void TileMapEditor::_notification(int p_what) {
 
 	switch (p_what) {
 
+		case NOTIFICATION_PROCESS: {
+
+			if (bucket_queue.size() && canvas_item_editor) {
+				canvas_item_editor->update();
+			}
+
+		} break;
+
 		case NOTIFICATION_ENTER_TREE: {
 
 			transp->set_icon(get_icon("Transpose", "EditorIcons"));
@@ -382,20 +390,26 @@ PoolVector<Vector2> TileMapEditor::_bucket_fill(const Point2i &p_start, bool era
 			bucket_cache = PoolVector<Vector2>();
 			bucket_cache_tile = prev_id;
 			bucket_cache_rect = r;
-		} else {
-			return bucket_cache;
+			bucket_queue.clear();
 		}
 	}
 
 	PoolVector<Vector2> points;
+	int count = 0;
+	int limit = 0;
 
-	List<Point2i> queue;
-	queue.push_back(p_start);
+	if (preview) {
+		limit = 1024;
+	} else {
+		bucket_queue.clear();
+	}
 
-	while (queue.size()) {
+	bucket_queue.push_back(p_start);
 
-		Point2i n = queue.front()->get();
-		queue.pop_front();
+	while (bucket_queue.size()) {
+
+		Point2i n = bucket_queue.front()->get();
+		bucket_queue.pop_front();
 
 		if (!r.has_point(n))
 			continue;
@@ -413,10 +427,15 @@ PoolVector<Vector2> TileMapEditor::_bucket_fill(const Point2i &p_start, bool era
 				points.push_back(n);
 			}
 
-			queue.push_back(n + Point2i(0, 1));
-			queue.push_back(n + Point2i(0, -1));
-			queue.push_back(n + Point2i(1, 0));
-			queue.push_back(n + Point2i(-1, 0));
+			bucket_queue.push_back(Point2i(n.x, n.y + 1));
+			bucket_queue.push_back(Point2i(n.x, n.y - 1));
+			bucket_queue.push_back(Point2i(n.x + 1, n.y));
+			bucket_queue.push_back(Point2i(n.x - 1, n.y));
+			count++;
+		}
+
+		if (limit > 0 && count >= limit) {
+			break;
 		}
 	}
 
@@ -1648,6 +1667,7 @@ TileMapEditorPlugin::TileMapEditorPlugin(EditorNode *p_node) {
 	tile_map_editor = memnew(TileMapEditor(p_node));
 	add_control_to_container(CONTAINER_CANVAS_EDITOR_SIDE, tile_map_editor);
 	tile_map_editor->hide();
+	tile_map_editor->set_process(true);
 }
 
 TileMapEditorPlugin::~TileMapEditorPlugin() {

editor/plugins/tile_map_editor_plugin.h

@@ -113,6 +113,7 @@ class TileMapEditor : public VBoxContainer {
 	Rect2i bucket_cache_rect;
 	int bucket_cache_tile;
 	PoolVector<Vector2> bucket_cache;
+	List<Point2i> bucket_queue;
 
 	struct CellOp {
 		int idx;