Column alignment messed up

[dennisrd]

E.g. with dummy.tracy.json, add a column with a long name, e.g. "XXXXXXXXXX" and 2 possible values that vary in length (e.g. "TTTTT" and "F", depending on whether column "listening" is true or false). Then add another column. Then shorten the name of the first added column, e.g. to "X". After this, column alignment is messed up. (It seems to correct itself when manually changing column widths.)