[Tree] Allow disabling auto generated tooltip for TreeItem

[AThousandShips]

The specifics of if the original behavior is desirable can be discussed, but this should be the most non-obtrusive approach to this, not disrupting existing behavior and just allowing you to configure this as wished

• Closes: TreeItem tooltip is repeating the item's text by default. #97154

[WhalesState]

Thank You.

[AThousandShips]

Future improvement could involve checking the fit of the text, like is done in TabBar:

godot/scene/gui/tab_bar.cpp

Lines 326 to 337 in 694d3c2

	String TabBar::get_tooltip(const Point2 &p_pos) const {
	int tab_idx = get_tab_idx_at_point(p_pos);
	if (tab_idx < 0) {
	return Control::get_tooltip(p_pos);
	}
	if (tabs[tab_idx].tooltip.is_empty() && tabs[tab_idx].truncated) {
	return tabs[tab_idx].text;
	}
	return tabs[tab_idx].tooltip;
	}

But that'd involve some more complex changes here so will leave that to a future improvement

[WhalesState]

But that'd involve some more complex changes here so will leave that to a future improvement

Since we already can set a custom tooltip, it may look like this.

String ItemList::get_tooltip() {
   if (auto_tooltip || not_fit) {
        String item_tooltip = text;
        if (!tooltip.is_empty()) {
            item_tooltip += "\n" + tooltip;
        }
        return item_tooltip;
   }
  return tooltip;
}

[AThousandShips]

I'll test some truncation code today and if it works out well I'll integrate it into this PR directly, but will keep it simple and match TabBar in that it won't combine the text and the tooltip and if you set a custom tooltip you'll have to do that yourself if you want it, the tooltip when set should be exactly what you set it as

[AThousandShips]

Haven't gotten around to digging into using truncation here so taking this out of draft on its own and will look at adding truncation checks when I can