Do not suggest duplicate commit messages

[Abbe98]

This makes sure no duplicate commit messages are suggested.

The issue illustrated:

I had to add a container variable to be able to use indexOf, the alternative would have been a loop as far as I know...

[bhousel]

Thanks! I changed it a little in 132a5b5 to use lodash _.uniqBy for simplicity.

[Abbe98]

Thanks @bhousel didn't know about _.uniqBy :-)

[Abbe98]

@tyrasd changeset comment suggestions seams to be working over at https://openstreetmap.us/iD/master/

[tyrasd]

ok, I see it now.

But, apparently, the API-0.6 changesets-call can be quite slow for users with many changesets. E.g. for me it takes around 5 to 6 seconds to load my last 100 changesets (for @manfredbrandl's account the situation is similar). And only after that the dropdown arrow will be shown.

Suggestion: Assuming that most users want to save their changes eventually, we could also load a user's changesets right after iD starts up (caching the contents locally), so that they're available immediately when the save-dialog is displayed.

[bhousel]

Suggestion: Assuming that most users want to save their changes eventually, we could also load a user's changesets right after iD starts up (caching the contents locally), so that they're available immediately when the save-dialog is displayed.

This is a good idea...