tdf#87075: Filter out unused directories from FILELISTs

...so that on macOS dictionary extensions don't pollute LibreOffice.app's
Contents/Resources/extensions/ with empty directories (that would then show up
as phantom extenions in the Extension Manager).

Change-Id: Iacff73e931885cde0fe507e384de80e9bd38d475

solenv/bin/modules/installer.pm

@@ -790,6 +790,7 @@ sub run {
                 $modulesinproductlanguageresolvedarrayref = installer::scriptitems::remove_not_required_spellcheckerlanguage_modules($modulesinproductlanguageresolvedarrayref);
 
                 $filesinproductlanguageresolvedarrayref = installer::scriptitems::remove_not_required_spellcheckerlanguage_files($filesinproductlanguageresolvedarrayref);
+                $directoriesforepmarrayref = installer::scriptitems::remove_not_required_spellcheckerlanguage_files($directoriesforepmarrayref);
             }
 
             installer::scriptitems::changing_name_of_language_dependent_keys($modulesinproductlanguageresolvedarrayref);

solenv/bin/modules/installer/scriptitems.pm

@@ -1595,6 +1595,7 @@ sub collect_directories_from_filesarray
                 $directoryhash{'specificlanguage'} = $onefile->{'specificlanguage'};
                 $directoryhash{'Dir'} = $onefile->{'Dir'};
                 $directoryhash{'modules'} = $onefile->{'modules'}; # NEW, saving modules
+                $directoryhash{'gid'} = $onefile->{'gid'};
 
                 $predefinedprogdir_added ||= $onefile->{'Dir'} eq "PREDEFINED_PROGDIR";
 
@@ -1604,6 +1605,15 @@ sub collect_directories_from_filesarray
             {
                 # Adding the modules to the module list!
                 $alldirectoryhash{$destinationpath}->{'modules'} .= "," . $onefile->{'modules'};
+                # Save file's gid iff this directory appears in only a single
+                # file's FILELIST (so that unused directories will be filtered
+                # out in remove_not_required_spellcheckerlanguage_files, based
+                # on gid):
+                if ($alldirectoryhash{$destinationpath}->{'gid'}
+                    ne $onefile->{'gid'})
+                {
+                    $alldirectoryhash{$destinationpath}->{'gid'} = '';
+                }
             }
         } while ($destinationpath =~ s/(^.*\S)\Q$installer::globals::separator\E(\S.*?)\s*$/$1/);  # as long as the path contains slashes
     }