When 'SHIFT+a' (capital letter A) is typed continuously in the JEditorPane,
after some repeats letters are not typed in-flow, rather typed in chunks.

When letters are continuously typed, should display typed letters continuously
one after the other.

To reproduce the problem :

1. cd to /net/sqesvr.eng/export/jfc/jfc_ws/Functional/SwingTextSupport
2. set JAVA_HOME to /net/sqesvr.eng/export/jfc/jdk1.4/solsparc
   setenv JAVA_HOME /net/sqesvr.eng/export/jfc/jdk1.4/solsparc
3. Execute following command :
  ${JAVA_HOME}/bin/java -Xint -cp lib/awtsqe.jar:classes/ JEditorPaneUndoTest

You will see the flow of typing gets chunky after typing for sometime. As well
as, this testcase fails to perform 'undo' & 'redo' operation correctly after
typing 1000 A's.

This is happening on Solaris sparc6 & 7 with -Xint mode. With default -Xmixed
mode, it is working fine.

This is also reproducible with the code attached to BugId: 4429261, but only
on SolarisSparc6 with -Xint mode.