possible bug with headline visibility cycling and whitespace

[Brian van den Broek <broek@cc.umanitoba.ca>]

Hi all,

I'm still new enough to org-mode that the problem might be with my 
understanding, rather than the code. But, I have a situation where 
org-mode doesn't behave as I expect.

To reproduce my problem, create the following org-mode file:

<Start of file>

* Heading Level One

** Heading Level Two

*** TODO Try to unfold this tree


* Heading Level One again


<End of File>

Everything between the start and end of file marks is needed, 
including the whitespace included on the lines after the 2nd- and 
3rd-level headings. (Note that this is more than just the newline 
characters; there are space characters on those lines as well.) Do not 
include the start and end of file marks.

Now, visit this org-mode file; it displays a blank line, the first 
three headings (with ellipsis), a blank line, and the final heading, 
as expected. Put the cursor on the first line, and <TAB> cycle so that 
only the two top-level headings are displayed. So far, so good.

Now, put the cursor on the first top-level heading. Attempt to <TAB> 
cycle. Observe that nothing happens. What was expected was cycling 
through the various displays of the subtree. <TAB> cycling on the top 
of the file still works as expected, as do S-<TAB> and C-u <TAB>.

Edit the file so as to remove all whitespace other than newlines from 
the various headlines that have them. Now, <TAB> cycling works as 
expected.

So, it appears that headlines followed only by whitespace where that 
whitespace includes more than newlines breaks <TAB> cycling. This 
feels like a bug to me, but again, it might be that I misunderstand 
how org-mode is intended to work.

I am using GNU Emacs 22.0.91.1 on ubuntu 7.04 and have org-mode 5.04 
(the same behaviour was manifest in 5.03). I have a number of org-mode 
tweaks in my .emacs, but nothing that I can recognize as related.

Thanks and best,

Brian vdB