Follow freedesktop spec for .desktop file and metainfo.xml

[stefonarch]

No description provided.

[stefonarch]

Needs fix for lxqt/lxqt-build-tools#87

[palinek]

I'm just curious, why is there the replacement of dash to underscore in lxqt-project, but not in LXimage-qt?

[stefonarch]

This is still to decide yet, IMO: All underscores, only in domain, no underscore. Atm I liked that more as it's a "well-known" name.

Well-known names containing the dash are allowed but not recommended, because the dash is not allowed in some related uses of reversed DNS names, such as D-Bus object paths and interface names, and Flatpak app IDs. If the author's domain name contains a dash, replacing it with an underscore is recommended: this cannot cause ambiguity, because underscores are not allowed in DNS domain names.

Looking at others there are several associations with dashes in the domain name.

[redtide]

Maybe this is more clear:
https://freedesktop.org/software/appstream/docs/chap-Metadata.html#tag-id-generic

To ensures the greatest possible compatibility of an AppStream ID, it is recommended to replace any hyphens in the ID with underscores, and prefix every leading digit of a section with an underscore as well. Since the underscore is not a valid character in domain names, the uniqueness of the ID is kept. For example, the ID org.7-zip.7zip could become org._7_zip._7zip.

This means underscore everywhere, also the name (and so as prefix if also the name has a digit, not just the domain)

[redtide]

@palinek maybe it might be interesting that string(MAKE_C_IDENTIFIER <string> <output_variable>) seems to do what desktop entry spec and appstream wants:

Convert each non-alphanumeric character in the input <string> to an underscore and store the result in the <output_variable>. If the first character of the <string> is a digit, an underscore will also be prepended to the result.

here my attempt to deal with the rules on CMake,

[stefonarch]

Could break user's file associations.