Reset x and y offset to 0 after clearing frame. Maybe this should be done in Frame.home().

exec/load/frame.js

@@ -917,6 +917,8 @@ Frame.prototype.pageup = function() {
 Frame.prototype.clear = function (attr) {
 	if (attr) this.attr = attr;
 	this.__properties__.data = [];
+	this.__position__.offset.x = 0;
+	this.__position__.offset.y = 0;
 	this.home();
 	this.invalidate();
 }