With these changes, if org-src-preserve-indentation is non-nil, or if
the block has a -i switch, then the behaviour of org-exp-blocks is
altered as follows:
1. Indentation is not removed before passing the block contents to the
block-transforming plugin.
2. The result returned by the plugin is not re-indented.
This happens regardless of types and presence of source-code blocks
in the buffer. Previously interblocks were only exported when
source-code blocks of the same "type" were present in the org-mode
buffer. This decision was placed around the assumption that
exporting small inline non-block objects only made sense in the
presence of some related block type. This assumption is
artificially limiting and is now removed from org-exp-blocks.
Carsten Dominik
Bernt Hansen
Eric Schulte
Dan Davison