Node edit form context bug

When adding contents for a node edit form context in different regions, say column 1 and column 2, the submitted form doesn't contain all the form field, hence they are not saved.

This bug causes fields on the regions other than the main form with submit button (as the form tag ends within the regions div element) to be forgotten.

This is due to panel_pages.module @ 753 where

$form = panels_context_get_form($panel_page->contexts);

should have been

$form = panels_context_get_form($panel_page->context);