The documentation for “g_app_info_equals()” just reads:

  “Checks if two #GAppInfos are equal.                                           
  Returns: %TRUE if @appinfo1 is equal to @appinfo2. %FALSE otherwise.”

Which is correct, but makes the reader think that the comparison takes into
account the *contents* of the GAppInfo objects. What gets compared is just
the application identifier — in Win32 the logic is a bit more elaborate,
but essentially not all the bits of contained data are compared either.

This has bitten GNOME Shell (see bug #773636) and could end up easily causing
bugs in other applications which may need to take into account the contents
of the GAppInfo and not just its identifier. There are concerns about extending
the comparisons done by “g_app_info_equals()” (see bug #774302), so at least it
would be desirable to make a point in the documentation about the behaviour.