mainmenu: Compare duplicated actions based on desktop filename

[City-busz]

Comparing name and comment is not reliable, as in some cases multiple apps may use the same name.

[tsujan]

Comparing name and comment is not reliable

The name and the comment are what is shown in the menu. It doesn't make sense to show items that aren't distinguishable from each other.

in some cases multiple apps may use the same name.

If those apps use the same name and comment, the problem should be fixed in them.

[City-busz]

On Arch Linux, there are two versions of gImageReader: gimagereader-gtk and gimagereader-qt, but both desktop files have the same name and comment. This is actually valid, the standard does not prohibit this, only the .desktop filename must be unique. Without this change, only one of them is visible during a search. I know this is rare, but it's technically more correct to show both rather than only one of them.

[tsujan]

the standard does not prohibit this

OK, but it's problematic in practice. If gimagereader-gtk and gimagereader-qt have the same name and the same comment, and if they can be installed alongside each other, there's no way to distinguish them from each other when they're shown in a menu. Their author(s) should change a name and/or a comment — after all, they're different, and that difference should be visible before launching them.