org-mhe-store-link alters window layout
If I run M-x org-store-link when my current emacs frame is just showing
one MH-E window (and nothing else in the frame), e.g. the "show-+inbox"
buffer, then the link to that email is created okay, but the window
frames are altered so that the +inbox summary window is also shown.
In general, the previous window contents are forgotten. I suggest
adding a 'save-window-excursion' into org-mhe-store-link so that the
window arrangement is preserved on exit from the function.
Patch below is long just because of the extra indentation.
Stephen