1.0dev: no spurious scroll up in wiki side-by-side edit (follow-up to r11109)
1.0dev: no spurious scroll up in wiki side-by-side edit (follow-up to r11109)

When editing at the bottom of the text area, after the preview and
the resulting resizing, we can observe an awkward "page up" effect
which moves the position of the cursor out of sight.

We remember the window scroll position before the preview and 
resets it afterwards, which cancels this unwanted move.



git-svn-id: f68c6b3b1dcd5d00a2560c384475aaef3bc99487@11115 af82e41b-90c4-0310-8c96-b1721e28e2e2

exocad/exotrac,exocad/exotrac,exocad/exotrac,exocad/exotrac