bug#69305: outline-minor-mode for tabulated-list-mode

[Juri Linkov]

> I hope that the new change will not affect the standard functionality
> of tabulated-list-mode which I use heavily.

Indeed, it should not affect the default behavior.

> Major grouping of tabulated-list-mode is by columns, not by rows, so
> I really wonder what will happen in the new outline-minor-mode for
> tabulated-list-mode when it is active and then user sort it by column

When sorted by column then rows in all groups will be sorted
by the same column.

> In my opinion tabulated shall remain tabulated, but I wish to see what
> is benefit of outline-minor-mode as I cannot understand it yet.

Rest assured, tabulated will remain tabulated, just outline heading lines
are added between groups.