Add support for adding tooltip to Tree title columns

[jinsediaoying]

add method:
Tree.SetColumnTooltip (columnIndex, tooltip);

[jinsediaoying]

#8331

[theraot]

I don't see you adding anything new here.

Perhaps you think you are getting more views, but that is unlikely, you are reaching the same set of people.

I suggest patience. People have different schedules and live in different time zones.

I upvoted your other post, I'm not somebody you reached because of this new one. I'll go post there now, as I don't think the conversation should continue here.

[jinsediaoying]

This post is about tooltip, and the other post is about icon.
I opened a new post because I think they are two different requests.
But as you suggest, I'll merge them into one post.

[AThousandShips]

Superseded by #8331