org-src: Fix indentation when tabs are involved
* lisp/org-src.el (org-src--source-type):
(org-src--tab-width): New variables.
(org-src--edit-element): Set variables above.
(org-src--contents-for-write-back): Re-indent properly non-blank lines
before inserting contents back into the source buffer.
(org-edit-src-code): Delegate block indentation to
`org-src--contents-for-write-back'.
* testing/lisp/test-org-src.el (test-org-src/indented-blocks): New
test.
Reported-by: Brent Goodrick <bgoodr@gmail.com>
<http://permalink.gmane.org/gmane.emacs.orgmode/113207>