Notebook find doesn't update

[jrieken]

• have MD cell with context below
• search for "F8"
• type while at the first match
• use arrow keys to go to next match
• 🐛 matches are off

### Some markdown

Issue Type: <b>Bug</b>

Using a GH Issues notebook.

1) I have a notebook with multiple cells referencing a macro. Change the name of the macro so that all cells using it show an error.
2) F8 repeated
-> From time to time, cells that have the keyboard focus are not revealed correctly.
-> Sometime,dddd the F8 problem zone gets stuck. I.e. while the keyboard focus moves forward the cell with the F8 problem zone stays in place.
-> When scrolling a cell with a F8 problem zone out of sight and then F8 again, the two problems become severe.

VS Code version: Code - Insiders 1.46.0-insider (da3bf754c3c0eabda1dc80ed9d627679ee560697, 2020-05-19T10:04:14.981Z)
OS version: Darwin x64 18.7.0
Remote OS version: Linux x64 5.3.0-1020-azure

[rebornix]

yup, auto search is not hooked up with it yet.

[rebornix]

The code changes to fix this turns out to be a bit large, so push this to May considering it's endgame.