Dungeon quest hand in reminder after last boss
 

After getting giga-triggered over forgetting to hand in a quest after a dungeon run and not being able to hand it in without doing the whole thing again, is there a mod or could their be interest in a mod that shows some large pop up after killing the last boss, if you have the quest in your journal, saying something along the lines of "HAND IN THE QUEST YOU DUMMY"

Because my dumb ass would like something like that

Not going to work on this but as information:
afaik the quests are not connected via API to the dungeons so it would be hard to see you got them activated.
Would be a large table of manually maintained data, growing/maybe even changed after ach patch :-(
Maybe LibQuestData got the collected data and also provides a way to detect its a dungeon quest.

I think there are achievements which could be connected to the dungeon's zoneId or similar, where a basich check like "Is a quest still open" could be read from via API functions.

Maybe one could detect it in general as you accept any quest and are currently within a dungeon.
But there also is no way to detect you want to leave the dungeon. There only is an event after a zone change (which could even happen with a loading screen inside the dungeon). So at each call to this even one would need to check if you are still in a dungeon, and if not remind you toport back in directly!
As there is no real way to detect this still insdie the dungeon without having to code some lsit of bosses and check if the last was killed! btw, not all dungeons need to get the last boss killed for the quest. There is no unqiue bossId, just names so this needs even more to be maintained in multi language...

So imho this addon would be way too much of a manual effort and you should just check your questlog BEFORE leaving any dungeon?
Or much easier: Press M to show the map, open the quest tab there and see if you got active quests in the zone = dungeon.
Or activate the quest tracker on screen, maybe exchange it by any other like Ravaloxx's, and track the current dungeonq quest so you see it is still active.
btw: If you port out and someone of your group is still in you could port back in and finish the quest. I thought this also would be possible if you enter it solo again, within a given time, but this might have changed.

Maybe add addons which improve quest handling, searches at the quest tab (if given), resort of quests in the log, etc.