alt+double-click to select multiple words with multiple cursors only selects to left of cursor

[ReedyBear]

Describe the bug
Only selects to left of cursor when selecting second & subsequent words with multi-cursor

To Reproduce

1. In insert mode. Click in the middle of a word
2. [alt+double-click] on the same word but not on the cursor: Enters visual mode, the whole word is selected, and cursor is at the right end of the word
   • Note: [alt+double-click] directly on the cursor: does not enter visual mode (probably because it's not initiating multi-cursor?)
   • Note: double-click a word to select w/out alt does NOT enter visual mode
3. [alt+double-click] the center of a different word: the 2nd word is selected from the cursor to the left & the 2nd cursor is at the left end of the second word
4. Repeat Add ex mode #3 & same thing happens for add'l words

Expected behavior
Regarding step #2 notes: This issue is not about those notes, but I noticed them and thought it worth mentioning

Regarding step #3: The entire word I double click should be selected, with the cursor at the right-hand side, just as selecting the first word did.

Screenshots
PHTML is the first word I selected

Environment (please complete the following information):

• Issue Type: Bug
• Extension Name: vim
• Extension Version: 1.17.1
• OS Version: Linux x64 5.8.13-200.fc32.x86_64
• VSCode version: 1.49.3

Additional context
I first had this issue in 1.17.0. In 1.16, it remained in insert mode when double-clicking to select words. I also mentioned this problem in #5218 though... it's probably not worth reading through that issue as I've better captured the information here. From that thread, I think it's SUPPOSED to go into Visual Mode & that is an intended breaking change.

[ReedyBear]

Regardless of how I select the first word (drag my cursor, double click w/out holding alt, alt+double-click directly on the existing cursor), [alt+double-click]ing the second word has the same behavior as described above.

[berknam]

@J-Fields I'm working on this one. I know what the problem is and have already fixed it but still want to test it more to make sure no other bugs are introduced. Will make a PR soon.