paste race condition

Describe the bug
holding 'p' pastes things into the wrong places (i.e. skips lines sometimes instead of pasting all the lines consecutively)

To Reproduce
Steps to reproduce the behavior:

1. open a file you don't much care about :P
2. at one of the first few lines of the file, write a loud comment like a fixme or something you wanna repeat so you don't forget to do it before committing :P
3. hit escape to go to normal mode but keep your cursor to that line
4. do a yy
5. hold "p" for a few seconds
6. See the pasted lines end up interwoven within the original file like a beautiful quilt

Expected behavior
The line pastes are consecutive

Screenshots

Environment (please complete the following information):

• Extension (VsCodeVim) version: 0.16.9
• VSCode version: 1.27.2
• OS: Linux - on kubuntu bionic

Additional context
I'm pretty sure this is a new bug post-0.16.6, because I'm sure I would have noticed it before - holding p like a maniac is something I do routinely.

The issue names no source files, tests, or entry points. Reproduce it by yanking a line in normal mode and holding p in VSCodeVim 0.16.9, then inspect the paste behavior; done means repeated pastes remain consecutive rather than becoming interwoven.