In the text editor, the undo stack is not properly getting handled when Word Wrap is on. It seems to not be pushing on the state when the cursor is moved up and down by the arrow keys. NOTE: it seems to only effect the up and down movement of the cursor, not left and right.

To recreate bug:
1) Add a couple lines of text in the Text Editor
2) Turn on word wrap (the lines of text dont actually need to be long enough to need to be wrapped)
3) Add a character in the middle of one of the lines of text
4) Go down or up a line(s) with the arrow keys
5) Hit Ctrl+Z

The cursor is not moved in the opposite direction, instead it deletes the character before the cursor, thinking it is in the proper position already

Ubuntu 10.10 32-bit
Blender r34288

Thanks,
Justin Dailey (dail)