Heading won't unfold on TAB if last line has just spaces, with empty line preceding.

[Giovanni Moretti <Giovanni@reflections.co.nz>]

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There's something weird with headings that can cause unfolding to fail. Headings can 
be folded with TAB refuse to unfold - they need Shift-TAB to see the contents. This 
is scary as it looks like content has been accidentally deleted whereas it's really 
just hidden.

The TAB-cycling worked as expected in Org 9.1.9 for the following example but fails 
in 9.4.

The example below illustrates the difficulties:

  * Block 1 - you can delete X to leave two empty lines and TAB on "Block 1" (or 1a)
    cycles as expected - GOOD!

But if the last line isn't empty but has spaces:

  * Block 2 - deleting X (leaving empty line) and then Z to leave the last line with
    just a space (one or more) and heading will fold on TAB /but won't unfold/.
    Shift-Tab is needed.
  * Block 3 - the same symptoms as Block 2 but has a subtree to show
    "Folded/Children/Subtree" when Tab-cycling on level one heading.

Cheers
Giovanni

===================

* Block 1 - OK
Block 1 text

** Block 1a heading
Block 1a content
X
X
* BAD BLOCK 2 - Delete X & Z, then TAB WON'T UNFOLD
Block 2 content
X
  Z
* BAD BLOCK 3 - TAB WON'T UNFOLD
   Block 2 content

** BAD BLOCK 3a
    Block 3a content
X
  Z
* Block 4 - OK
The end




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