fix some glitches

Author: jan-br

example/lwjgl3-opengl/build.gradle

@@ -38,6 +38,7 @@ dependencies {
     implementation group: 'org.lwjgl', name: 'lwjgl-glfw', version: '3.2.2'
     runtimeOnly group: 'org.lwjgl', name: 'lwjgl-glfw', version: '3.2.2', classifier: lwjglClassifier()
 
+    implementation group:'com.google.code.gson', name:'gson', version: '2.8.6'
 }
 
 def runDir = file("run")

example/lwjgl3-opengl/src/main/java/com/labymedia/ultralight/lwjgl3/opengl/ExampleApplication.java

@@ -228,7 +228,7 @@ public void run() {
         glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 
         // Load a local test file
-        webController.loadURL("file:///example.html");
+        webController.loadURL("http://localhost:8080");
 
         double lastTime = glfwGetTime();
         int frameCount = 0;

example/lwjgl3-opengl/src/main/java/com/labymedia/ultralight/lwjgl3/opengl/support/WebController.java

@@ -67,6 +67,7 @@ public WebController(CursorAdapter cursorManager, long window) {
 
         this.platform.setConfig(
                 new UltralightConfig()
+                        .forceRepaint(true)
                         .resourcePath("./resources/")
                         .fontHinting(FontHinting.NORMAL)
         );