Add Cursor to Line Ends Errors From Visual Line Mode

[ralphcallaway]

Describe the bug
When trying to go from visual line mode to multi-cursor mode encountering an unexpected selection mode that is difficult to recover from

To Reproduce
Steps to reproduce the behavior:

1. open text file with more than a couple lines
2. V (enter visual line)
3. 5j (select five lines)
4. super-L (add cursors to line ends, cmd-shift-l is the default key binding on mac os x)
5. Get ModeHandler: unexpected selection mode. selectionMode=4 error
6. Click 'Dismiss'
7. Immediately get same error
8. Sometimes I can my way out of this and can continue, sometimes I can't get rid of the error, but can continue working, sometimes i just toggle vim mode and revert back to pre vim ways

Expected behavior
Enter some sort of multi-cursor mode without errors (personally, I'd like to be in normal multi-cursor mode)

Environment (please complete the following information):

• Extension (VsCodeVim) version: 1.11.3
• VSCode version: 1.40.1
• OS: Mac 10.14.6

Additional context
I fell in love with multi-cursors before vim, and admittedly the two styles kind of fight with each other. But now that I'm getting to be slightly comfortable with vim, I really want to be able to use the normal mode command and motions with multiple cursors.

My $0.02 is that regardless of the current mode, any multi-cursor action should put you into normal multi-cursor mode, and if you want a different mode proceed from there.

[J-Fields]

If you have multiple cursors and try to start visual line mode with V, I see the same issue. It's likely the same root cause.

[ralphcallaway]

fwiw if you stick in a strictly vim command context this works just fine

• V start visual line mode
• 5j select some lines
• I/A enter multi-line insert mode with cursors at start/end of line respectively