fix(NcActions): Show last action entry only partial to make it discoverable

[susnux]

☑️ Resolves

• Resolves [Bug]: Specific screen-resolutions can hide options in the new-file (of type) pulldown nextcloud/server#44463

1. Fix wrong event name - the event is named apply-show and not after-show
2. If the popover content is too large and will be capped (max-height) make sure the last element is shown only partially, so users can discover there is more to scroll.

🖼️ Screenshots

See that before you can not see any hint of the overflow:

🏚️ Before	🏡 After

🏁 Checklist

• ⛑️ Tests are included or are not applicable
• 📘 Component documentation has been extended, updated or is not applicable
• 3️⃣ Backport to next requested with a Vue 3 upgrade

[susnux]

cc @nextcloud-libraries/designers

[szaimen]

Screenshots look good to me :)
(but didnt test and didnt review the code)

[Pytal]

Tested with different viewport heights and works nicely!

[susnux]

/backport to next

[jancborchardt]

@susnux we also need to keep in mind this one though: #3920
Yes long menus should have the last entry halved, but in general the menus can take up more vertical space.

[susnux]

but in general the menus can take up more vertical space.

Yes but that is a different story and should be handled as its own. This only fixes menus overflowing our "maximum" to show the last one half.

[skjnldsv]

• Fix wrong event name - the event is named apply-show and not after-show

Actually not sure, we do change the event name by catching it in the NcPopover
https://github.com/nextcloud/nextcloud-vue/blob/dd7ba318cc651cc2c32f69cab2a05d561a53122a/src/components/NcPopover/NcPopover.vue#L168-L169
https://github.com/nextcloud/nextcloud-vue/blob/dd7ba318cc651cc2c32f69cab2a05d561a53122a/src/components/NcPopover/NcPopover.vue#L401
https://github.com/nextcloud/nextcloud-vue/blob/dd7ba318cc651cc2c32f69cab2a05d561a53122a/src/components/NcPopover/NcPopover.vue#L410

[susnux]

Actually not sure, we do change the event name by catching it in the NcPopover

We also forward all listeners so we should be good either way. But seems you are right...
A bit weird to have two events with exactly the same meaning :/