When I try to edit article section and I switch the editor from VisualEditor, back to SourceEditor and then exit the SourceEditor system doesn't unregister the edit action I made to start VisualEditor. Now when I try to edit any other section (because the edit icon of the section I was editing is not clickable), it opens the SourceEditor for section, and when I close the editor it reopens new editor for the first section I started editing.

Browser+OS: Debian 9.6 + Firefox 60

Steps to reproduce:

• Open any page in mobile view, lets say https://en.m.wikipedia.org/wiki/New_York_State_Route_22
• click edit on Section Route description
• Only if you're in source editing mode: switch to VisualEditor
• switch to to source editing mode
• close the editor using the X button in left-top corner
• try to edit the Route description section once again > First bug: It doesn't work
• try to edit the The Bronx to Kensico Dam
• the source editor shows up with The bronx to Kensico Dam
• try to close the editor - Second Bug: the source editor for Route description/ becomes visible
• try to close the editor again, it gets closed
• try to edit the Route description - still doesn't work
• every time you edit a section different than Route description first it opens the editor for section you want to edit, and then opens the Route description editor once again.

The problem goes away a after page refresh. Most probably switching editor from VisualEditor to SourceEditor should reset all VisualEditor-related state - otherwise closing SourceEditor doesn't reset the JS state properly.