#1446 Show VScrollBar always has thumb at position 0

[Eric Promislow]

Calling SetVScrollBar(true) to redisplay the scroll bar initially puts the thumb back at
position 0, regardless of position of CurrentPos/Anchor. I find if I call LineScrollDown(1);LineScrollUp(1) the thumb moves to the correct position.

Or is there another call I need to make? This happens in Komodo on Windows and OSX, but not Linux (Ubuntu). Ref http://bugs.activestate.com/show_bug.cgi?id=97483

[Neil Hodgson]

This patch should fix it.

[Neil Hodgson]

Committed fix as [e09098].