I have just pushed the fix for #2220 
<https://github.com/leo-editor/leo-editor/issues/2220> to the devel and 6.4 
branches. See PR #2222 <https://github.com/leo-editor/leo-editor/pull/2222>.

* The fixes were non-trivial. Please test the 6.4 today!!!* 

In keeping with the new era in unit testing, I did most of the work in 
devel using a strong new unit test. I then carefully merged the changed 
code into the 6.4 branch, ran all the unit tests in unitTest.leo and did 
some more hand tests.

It's unpleasant to make such major changes just before 6.4, but i see no 
good alternative. The new code is *much* better than the old. Not only does 
the new code fix the reported problem, but for the first time (ever? in 
years?) undo works in headlines. It's amazing that these bugs have been 
around so long!

*Summary*

The 6.4 branch contains fixes to several *serious* bugs involving 
headlines. I see no alternative but to include these fixes in the 6.4 
release.

Please test the 6.4 branch today.  Leo 6.4 is going out the door 
tomorrow!!!!!!!

Many thanks to SegundoBob for reporting #2220.

Edward

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