Implement doorhanger/nagbar notifications

[anonymous]

Something similar to how modern browsers ask you if you want it to remember the password you just entered.

While this could be useful for many things, I'm thinking of the "you moved more than x items" dialog. Most of the time I noticed I accidentally moved many things and impulsively hit ctrl+z to undo. Due to the dialog, it doesn't work of course and I have to select "yes undo".

There's always the option to turn it off but because I sometimes really don't notice my mistake I don't want to turn it off. Nagbars could satisfy both: being unobstrusive when I know what I am doing while still being noticable enough if an error has been made.