Window "jumps" to left if you edit line wider than window at the right end

[GoogleCodeExporter]

What steps will reproduce the problem?
1. In Eclipse editor window you have a text line that wider than the
window's wide. You scroll the window to right and place cursor at any
position whose number is larger the window's wide. You type any symbol and
windows scrolls completely back to left and the cursor becomes invisible,
beside of the right edge of the window though it remains on the editing
position.

What is the expected output? What do you see instead?
It is expected that the window stays on the same scrolling postion but not
"jumps" to the left side.

What version of the product are you using? On what operating system?
Coffee-Bytes Code Folding 1.0.6 on Eclipse Platform 3.4.1

Please provide any additional information below.

Original issue reported on code.google.com by zol...@web.de on 15 Jan 2009 at 10:46