User interface improvement: allow users to scroll through abilities, but, in general, scroll through any long listing

[shevegen]

I could file this on the github tracker, but I thought I should add a discussion first here - more people seem to use the forum than the github tracker.

I am playing the epic campaign again with like 200 scenarios or more. The one with tons of items and customized abilities and Belzebub and what not. I keep on forgetting the name...

Anyway. When there are too many abilities listed, I can not scroll through them and thus tend to miss out on a few. Like right now "Warlords rule" - it shows up during an attack, but I can not read it anywhere else because at the right end there appears only the "...", but not enough for me to get that "pop up" window.

Here I thought: what if we could, in this case, add two small arrows, boxes, one up and the other one down; or one left and the other one right.

This could appear in general for all entries where the user is given a choice for scroll-action. This can happen on a mouse-click event, e. g.
if you click on it, it scrolls forward or backward.

I am not sure such functionality has been integrated into the wesnoth UI yet; and I read elsewhere about the discussions to transition to a new GUI framework (but I highly recommend retaining being able to build wesnoth with the classic GUI, for many reasons - imagine a situation where it no longer builds, and everyone who was porting it drops off because it is no longer fun, that happened in other FOSS games I could watch).

Being able to scroll manually would be nice IMO.

On a side note, it would be nice if the in-game wiki could be made a bit more flexible, e. g. where all custom abilities in a campaign, IF they have a description also appear on the wiki and can be searched. That would be a workaround over the GUI suggestion above, e. g. in pseudocode:

"if this unit has a new ability, and/or new item,
add to the wiki entry about this ability"

If you know what I mean ^^^.

PS: also perhaps allow a way for users to trigger this pop-up window. Right now I can only get it on a on-mouse-hover action it seems. May be useful to be able to invoke it in other ways too, perhaps some keybinding that is not yet in use, or something like that.

[Toranks]

Related:
https://github.com/wesnoth/wesnoth/issues/7113

[dwarftough]

I wonder if we can just list abilities each on a new line, not as a comma separated list in the right bar.