ScrollView: Add always_enable_overscroll property on scrollview

[tshirtman]

fix: #6665

[matham]

Shouldn't this be True by default? Also, I think always_overscroll is probably better as it's more concise. Although it would be nice to be more specific than always, as that's quite vague as to what it means. Maybe even overscroll_smaller_viewport, although it's a bit wordy.

[tshirtman]

I figured making it True by default could be an unwanted change in behavior, and i tend to be conservative about these things, even if i think it's indeed a better default behavior, if you think it's good enough to allow people who don't want this behavior to disable it, then i'm fine with switching the default value.

the "always" seems important to me as currently we have overscroll only in the specific situation where the content is big enough to allow scrolling, this just makes the behavior unconditonnal.

Also, it did remind me that it's impossible to overscroll with the mousewheel currently, (and with this patch it's now possible… but only if the content is small enough to prevent normal scrolling 😬 😆) i think this should be changed and mouse scroll should work the same as touch scroll in that regard, any opinion?

[tshirtman]

Renamed the property, and enabled it by default, documented the fact that you should disable it to get the previous behavior back.

[matham]

Looks ok if you're happy with it!?

[pythonic64]

@tshirtman Shouldn't there be a new line before versionadded tag?

[tshirtman]

hm, maybe, i'll add it along the unittest fix, good call.

[pythonic64]

Maybe docs won't be generated property without new line.
Also, better readability :)

[tshirtman]

yes, and the .. before was missing as well, good thing you mentioned it.