Cmd+D loses multiple selections

Is this a BUG REPORT or FEATURE REQUEST? (choose one): BUG REPORT

What happened: After a recent VSCodeVim update (since v0.10.12?), pressing Cmd+D sometimes loses multiple selections

What did you expect to happen: Selections should be maintained when using Cmd+D to select multiple occurrences

How to reproduce it (as minimally and precisely as possible):

• In normal mode, position the cursor within a word that is repeated within the current buffer
• Press viw to select the current word in visual mode
• Press Cmd+D; another cursor is created at the next occurrence, and the status bar indicates that the editor is still in visual mode, however the selection is lost and the cursors are moved to one character after the ends of the words (preventing the ability to use c to replace both selected occurrences).

Environment: macOS

• Extension (VsCodeVim) version: 0.10.3
• VSCode version: 1.19.2
• OS version: 10.12.6

Reproduce the issue in the VSCodeVim extension using the stated macOS, VSCode, and extension versions: enter visual mode with viw, then press Cmd+D on repeated words. Trace the handling of visual selections and multiple cursors, and verify that both occurrences remain selected so c can replace them together.