Fix set_url_scheme_handler_gnome3 to not associate text/html handler
This fixes #206 (closed). Tested with xdg-settings set default-url-scheme-handler logseq Logseq.desktop
Old behavior:
mimeapps.list adds the lines:
text/html=Logseq.desktop
x-scheme-handler/logseq=Logseq.desktop
Logseq.desktop adds the line:
MimeType=text/html;x-scheme-handler/logseq;
New behavior:
mimeapps.list adds the line:
x-scheme-handler/logseq=Logseq.desktop
Logseq.desktop adds the line:
MimeType=x-scheme-handler/logseq;