Fix mimetype detection using magic library

for mime types not contained in TDE settings
This resolves Bug 2392

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit b0ac7d2879)

mimetypes/application/octet-stream.desktop

@@ -1,6 +1,7 @@
 [Desktop Entry]
 Type=MimeType
 MimeType=application/octet-stream
+X-TDE-PatternsAccuracy=0
 Comment=Unknown
 Comment[af]=Onbekende
 Comment[ar]=غير معروف

tdeio/tdeio/kmimetype.cpp

@@ -221,8 +221,12 @@ KMimeType::Ptr KMimeType::findByURL( const KURL& _url, mode_t _mode,
                     KMimeMagicResult* result =
                             KMimeMagic::self()->findFileType( path );
 
-                    if ( result && result->isValid() && result->accuracy() > 0 )
-                        return mimeType( result->mimeType() );
+                    if ( result && result->isValid() && result->accuracy() > 0 ) {
+                        KMimeType::Ptr resultMime = mimeType( result->mimeType() );
+                        if (resultMime->patternsAccuracy() > 0) {
+                            return resultMime;
+                        }
+                    }
                 }
             }