Bug: headlines escape blocks [9.3 (9.3-elpaplus @ /home/tom/.emacs.d/elpa/org-plus-contrib-20191203/)]

[Tom Gillespie <tgbugs@gmail.com>]

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* Description
Headlines are not ignored inside of blocks when the headline is not indented.

* Affected versions
9.1.9, 9.3

* Observed behavior
Lines starting with any headline pattern =*=, =**= etc. are treated as
headlines inside all block types. Example and source blocks highlight
as if the text is escaped, diverging from the behavior of org-mode.
Verse blocks highlight as a headline, in agreement with the behavior.

* Expected behavior
I would expect the behavior implied by the highlighting in the example
and source blocks. Blocks should take precedence over the headline
behavior.

* Reproduction
See example below (attached as a standalone file as well).

---------------
To reproduce =emacs -q --load org -- org-bug-1.org=
#+BEGIN_EXAMPLE
* This should not be treated as a header
but for some reason it is
#+END_EXAMPLE

#+BEGIN_SRC
* Neither should this be treated as a header
but for some reason it is
** And so is this
#+END_SRC

#+BEGIN_VERSE
* Ode to a left aligned headline
this one colors correctly
#+END_VERSE

 #+BEGIN_SRC
* This one does not highlight correctly
hrm
 #+END_SRC
---------------

Emacs  : GNU Emacs 26.3 (build 1, x86_64-pc-linux-gnu, X toolkit)
 of 2019-09-27
Package: Org mode version 9.3 (9.3-elpaplus @
/home/tom/.emacs.d/elpa/org-plus-contrib-20191203/)
Package: Org mode version 9.1.9 (release_9.1.9-65-g5e4542 @
/usr/share/emacs/26.3/lisp/org/)

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