JTexPane: Cross-platform chaos

I've extended a JTextPane to preserve tabindex and implement block-
indentation. It is supposed to work much like a code editor. Check out the
resulting applet, rigged up for Firefox only, over at:

<url:http://www.wunderbyte.com/editorapplet>

I realize you may not have multuple operating systems running
simultaniously, so you have to trust me on this: It works perfectly on
Linux but fails on Windows. Things get calculated weirdly and unpredictably
and I have absolutely no idea where to start looking:

- does Java on Windows not use '\n' and '\t' characters?
- is it a bug in the JtextPane implementation on Windows?
- is my thinking not straight?

I've spent a lot of time learning Java so that I could build this applet,
and I have loads of dependant application code prepared already, so I would
*really* appreciate it if you could look it over and maybe come up with a
hint. Here's the source code in txt-format:

<url:http://www.wunderbyte.com/editorapplet/EditorTextPane.txt>



--
Wired Earp
Wunderbyte


.

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