Make repeating a subtree-restricted export command remember the subtree
Export commands can be restricted to a specific subtree. When using a
prefix argument to org-export-dispatch, the restriction did not stick,
i.e. the command would be restricted to whatever note the cursor
happens to be in. This made it difficult to repeat export of a
subtree while editing it. This change introduces a new marker and
uses this marker to remember the cursor position of the previous
export command. So repeating a subtree-restricted command will now
re-export the same subtree, provided you are still in the same
buffer. To break this connection, just make a new export without
relying on the prefix argument.
* lisp/ox.el (org-export-dispatch-last-position): New variable
(org-export-dispatch): Save position of cursor at the moment when
the export command is called. Restore that position temporarily
when repeating the previous export command.