bug: grid flickers when you toggle the command palette

[jimniels]

For some reason, and I've only been able to consistently reproduce this on the default example file, if you toggle the code cell outlines and then open the command palette, all the data on the grid just disappears. As soon as you scroll like 1px, it reappears. It doesn't seem to happen in other files, just the default example file.

Steps:

• Open the default example file
• Toggle the code cell outlines
• Open the command palette