BUG: colspan on tree grid doesn't display column border

Suite and Optimus Suite 7
#1

I have a treegrid with two headers.

When I put a colspan on some of the columns in the top header, the border on the last colspan column is not displayed.

This happens with value 4.

colspan: 4

If the value is 2 or 3 the border of the last column cell is displayed, but when the value is 4 - it isn’t.

This issue seems to happen when the columns are set via the setColumns method.

#2

Hello Nikolai.

Could you please, provide some code snippet so the problem could be reconstructed locally.
The following example seems to work well:
https://snippet.dhtmlx.com/amsj05wy