Describe the bug
EasyMotion is assigning labels to matching items starting from a line that is too far forward, extending beyond the visible display area.

I'm currently using VSCode to read a book, because I find it easier to highlight words and add comments etc using VSCodeVim extension, and the easymotion emulation provided by VSCodeVim is very helpful in navigating in text. But EasyMotion is assigning labels to matching items starting from a line that is too far forward, extending beyond the visible display area, sometimes all the labels would run out before the first visible line, making it impossible to navigate in text.

Possibly related
This may have something to do with the book I'm reading having very long lines and my turning Word Wrap on.

To Reproduce
Steps to reproduce the behavior:

1. open a txt with a lot a words per line.
2. turn on word wrap.
3. type <leader><leader><leader>bdw to search for start of word.
4. observe that there's no label on any word within screen area.
5. scroll up and up and find that all the possible combinations of the characters used as jump markers are used up for labeling words far beyond the actual display area.

Expected behavior
easymotion to assign jump markers starting from the first word that's in the current display area.

Environment (please complete the following information):

• Extension (VsCodeVim) version: 1.27.1
• VSCode version: 1.84.2
• OS: macOS 10.15.4