Fix Bug 442503
This is a fix for https://bugs.kde.org/show_bug.cgi?id=442503.
I am not sure what the reason for the default value in normClamp
was, but for me, such a default value is a bit strange. Now, if we are in trimmed moed and the desired position of the view is trimmed away, then we go to either the end or to the start of the page (depending on whether the desired position is after or before the trimmed region).