[#1261] Fix quadtree debug drawing not rendering

_drawQuadTree() runs in GAME_AFTER_DRAW which fires after
renderer.flush(). Add an explicit flush() after drawing so
the quadtree lines are submitted to the GPU.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: obiot

packages/debug-plugin/CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 15.0.2
+
+### Bug Fixes
+- Fixed quadtree debug visualization not rendering — draw calls were issued after `renderer.flush()`, so the quadtree lines were never submitted to the GPU
+
 ## 15.0.1
 
 ### Bug Fixes

packages/debug-plugin/package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@melonjs/debug-plugin",
-	"version": "15.0.1",
+	"version": "15.0.2",
 	"description": "melonJS debug plugin",
 	"homepage": "https://github.com/melonjs/melonJS/tree/master/packages/debug-plugin#readme",
 	"type": "module",

packages/debug-plugin/src/debugPanel.js

@@ -298,6 +298,9 @@ export class DebugPanel {
 		this._drawQuadTreeNode(renderer, game.world.broadphase);
 		renderer.translate(x, y);
 		renderer.restore();
+		// flush is needed because this runs after GAME_AFTER_DRAW,
+		// which is emitted after the main renderer.flush()
+		renderer.flush();
 	}
 
 	/** @private */