Indenting a folded code block makes the block "disappear"

What steps will reproduce the problem?
1. Make a foldable code block, e.g. a function with def keyword
2. fold the code block, e.g. fold everything below def keyword
3. indent the code block head, e.g. indent the def line

What is the expected output? What do you see instead?
The normal behavior is that the code block should unfold as the block head
is indented (a behavior in other editors).  Intead, the folded code
"disappears", i.e. the editor does not know if the code is still there.  At
the indented state, there is no way of knowing if the code is there, and
the code cannot be unfolded unless the block head is unindented.

IMPORTANT!!! Please answer these questions for any and ALL bug reports

What version of the product are you using? On what operating system?
Ubuntu 9.10.  I have seen this on previous versions of Ubuntu as well.
Editra 5.15.  I have seen this on previous versions of Editra as well.

What method of install was your version installed with (Binary/Source)?
Source

If from source: What version of python and wxPython are you using?
The newest, 2.8.10

Please provide any additional information below.

Original issue reported on code.google.com by the.min...@gmail.com on 11 Nov 2009 at 4:48

DeltaEscher / editra

Indenting a folded code block makes the block "disappear" #428