core/proxywindow: notify for width/height changes after connect

Previously the content item would resize but w/h wouldn't be updated.

Author: outfoxxed

src/window/proxywindow.cpp

@@ -154,9 +154,11 @@ void ProxyWindowBase::completeWindow() {
 	this->setColor(this->mColor);
 	this->updateMask();
 
-	// notify initial x and y positions
+	// notify initial / post-connection geometry
 	emit this->xChanged();
 	emit this->yChanged();
+	emit this->widthChanged();
+	emit this->heightChanged();
 
 	this->mContentItem->setParentItem(this->window->contentItem());
 	this->mContentItem->setWidth(this->width());