Undo/redo doesn't work after calling SyntaxDocument.clearUndos()

What steps will reproduce the problem?

I have the following code:

JEditorPane jep; 

DefaultSyntaxKit.initKit();

(...)

jep.setContentType("text/java");

(...)

jep.setText(string containing code obtained from a file);

((jsyntaxpane.SyntaxDocument)jep.getDocument()).clearUndos();

What is the expected output? What do you see instead?

I expect the undo/redo system to work after the call to clearUndos() 
(except that it shouldn't undo the setText() action that I do in the code, 
which was the reason for the clearUndos()).

Instead, the undo/redo system doesn't seem to work at all after the call 
to clearUndos(). It doesn't undo any action that I perform later.

If I remove the line with clearUndos(), the undo/redo system does work.

What version of the product are you using? On what operating system?

jsyntaxpane-0.9.5-b27.jar, Java 1.6, Windows Vista

Original issue reported on code.google.com by komoku on 9 Feb 2010 at 3:27

javalover520 / jsyntaxpane

Undo/redo doesn't work after calling SyntaxDocument.clearUndos() #132