Fix first and last action input padding

[raimund-schluessler]

This fixes the padding of the ActionInput in case it is the first or last entry. The currently set margin lead to a gap between the popover arrow and the input element.

Before:

After:

In case one switches from ActionButton to ActionInput like it happens in Calendar, this will still lead to a "jumping" of the popover menu, since the ActionButton has a different height than the ActionInput with the additional padding (see nextcloud/calendar#3016). But the gap is not there anymore.

On a side note: I would say the additional padding is not really necessary (or at least to high). But since this is supposed to be a bug fix PR, I didn't remove it, but instead made it work properly 😉. @jancborchardt maybe to check if this is really what it is supposed to look like.

[juliusknorr]

Fine by me for a bugfix

On a side note: I would say the additional padding is not really necessary (or at least to high). But since this is supposed to be a bug fix PR, I didn't remove it, but instead made it work properly wink. @jancborchardt maybe to check if this is really what it is supposed to look like.

I agree, either that or we need to make sure the spacing applies to all elements. The only thing where this might be odd is with the hover/focus feedback of the ActionButton, which if we increase just the top padding would look rather unaligned with the background then.

[raimund-schluessler]

I agree, either that or we need to make sure the spacing applies to all elements. The only thing where this might be odd is with the hover/focus feedback of the ActionButton, which if we increase just the top padding would look rather unaligned with the background then.

Not sure if it's a good idea to apply it to all elements. This will look really unaligned.