"add column" keybindings not working in matrix

[gunnarmein-ts]

Description

When I create a matrix, I can add rows, but not columns

Steps to Reproduce

go to the mathlive demo page, click mathfield
ctrl-a, delete to clear
option-[ to create matrix
ctrl-enter to create some more rows
ctrl-, should create additional column, as documented in https://cortexjs.io/mathlive/reference/keybindings/
-> but doesn't.

Actual Behavior

Nothing happens when I press crtl-,

Expected Behavior

I would expect an additional column for the matrix

Environment

cortexjs.io 0.99.0
Don't know whether this worked before (it doesn't in 0.98.6)
macOS, Chrome current, also Safari current

[arnog]

The current keyboard shortcut to add a column is alt+tab and alt+shift+tab

[gunnarmein-ts]

Thanks! Doc bug?