Multi file highlighting doesn't work in editor grid layout

[gregvanl]

Testing #196342

1. Switch the editor to Grid layout (View > Editor Layout > Grid (2x2))
2. Open the same file in each editor (for the repro I used Markdown file /docs/getstarted/userinterface.md in a local clone of the vscode-docs repo).
3. In the top left editor, click on "heart"

Only the top right editor displays "heart" as highlighted. "heart" is not highlighted in the other two bottom editors.

Trying clicking on words in the other editors, only the top right seems to get highlighting.

[gregvanl]

Even with double-clicking to select the text (in this image below "the") again only the top right editor has highlighting.

[gregvanl]

Works better if different files are in the bottom grid positions. Cursor in on top left "the".

[Yoyokrazy]

Closing as fixed, can't repro this and there have been a number of improvements to multi-doc highlighting since. Feel free to reopen with a repro or info of the current problem if it persists.