Moved user-select: none from property grid to element separator to allow a user to highlight the text values.
Add tabindex: -1 to element separator so it is not keyboard focusable. It already had :focus { outline: 0; } which hides the focus, this now disables focus.
Changed .components-property-label-renderer-colon from a <span> to an ::after.
Testing
Confirmed that resizing columns does not unintentionally highlight text.
Used the tab to confirm that the resizer is no longer taking focus.
Changes
user-select: nonefrom property grid to element separator to allow a user to highlight the text values.tabindex: -1to element separator so it is not keyboard focusable. It already had:focus { outline: 0; }which hides the focus, this now disables focus..components-property-label-renderer-colonfrom a<span>to an::after.Testing