[Editor] Newly added column not visible after column resize

[mbechev]

Describe the bug
If we manually resize the columns of a table, causes the newly added columns to have no width. Thus they would be visually invisible (but exist in the DOM).

editor-issue.mov

The issue is reproducible in the demo from the site:
https://www.telerik.com/kendo-angular-ui/components/editor/tools/#toc-built-in-tools

1. Add a table with some columns.
2. Resize each column width.
3. Try to add a new column using the built-in tool.
4. The column is added, but without any width.

If we resize some of the columns (not all) or don't change their width, adding a column to the table works correctly.