🎉 Add initial KWin version of the portal effect

kwin/portal/onAnimationBegin.js

@@ -0,0 +1,7 @@
+// SPDX-FileCopyrightText: Simon Schneegans <code@simonschneegans.de>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+// This part is automatically included in the effect's source during the build process.
+// The code below is called whenever a window is closed or opened.
+
+effect.setUniform(this.shader, 'uSeed', [Math.random(), Math.random()]);