fix PageUp/PageDown: clientHeight works, one of the other heights was the full document height.

webengineviewer/src/webenginescript.cpp

@@ -126,11 +126,10 @@ QString WebEngineScript::searchElementPosition(const QString &elementStr)
 QString WebEngineScript::scrollPercentage(int percent)
 {
     const QString source = QString::fromLatin1("var current = document.body.scrollTop;"
-                           "var body = document.body;"
-                           "html = document.documentElement;"
-                           "var height = Math.max( body.scrollHeight, body.offsetHeight, html.clientHeight, html.scrollHeight, html.offsetHeight );"
+                           "var docElement = document.documentElement;"
+                           "var height = docElement.clientHeight;"
                            "var newPosition = current + height * %1 /100;"
-                           "window.scrollTo(window.scrollX, newPosition); [window.scrollX, window.scrollY];").arg(percent);
+                           "window.scrollTo(window.scrollX, newPosition);").arg(percent);
 
     //qDebug() << "QString WebEngineScript::scrollPercentage(int percent) " << source;
     return source;