[Feature request] Avoid double import of GPX-files

[update-freak]

Hi developer,

I import all my GPX-file (about 200) from a folder.
Accidently I imported them again after I did the update to v.0.12.0.
So maybe it would be good to have a import check to avoid double import, e.g. depending on name etc. a message:
"Track XY already exists. Are you sure to import this track" -> Yes, to still import and No, to skip the import of this single file.
This should then also work for importing a whole folder with multiple files.

[update-freak]

and I think it would makes to have also the following option in the settings how to handle the import of double tracks:

• skip all double found tracks while the import => with this setting it's still possible to select whole folders with large amount of GPX-files
• raise the message while importing and a track is already there => message as in my first post (skip or import)

[Flomp]

I agree that this should be an option when importing. IMO, this check should not simply be based on the name though but rather on geospatial similarity between tracks (aka the uploaded track follows an already uploaded track closely).

That is of course a much more complicated problem to solve than a simple string comparison. But I think that this is a feature that might also come in handy in other parts of the app. So I'll look into it and report back.