In fd069bee "initial import" the code was:

+void SfxFilter::InitMembers_Impl()
+{
+    String aExts = GetWildcard()();
+    String aShort, aLong;
+    String aRet;
+    sal_uInt16 nMaxLength =
+#if defined( WIN ) || defined( OS2 )
+        3
+#else
+        USHRT_MAX
+#endif
+        ;
+    String aTest;
+    sal_uInt16 nPos = 0;
+    while( ( aRet = aExts.GetToken( nPos++, ';' ) ).Len() )
+    {
+        aTest = aRet;
+        aTest.SearchAndReplace( DEFINE_CONST_UNICODE( "*." ), String() );
+        if( aTest.Len() <= nMaxLength )
+        {
+            if( aShort.Len() ) aShort += ';';
+            aShort += aRet;
+        }
+        else
+        {
+            if( aLong.Len() ) aLong += ';';
+            aLong += aRet;
+        }
+    }
+    if( aShort.Len() && aLong.Len() )
+    {
+        aShort += ';';
+        aShort += aLong;
+    }
+    aWildCard = aShort;
+
+    nVersion = SOFFICE_FILEFORMAT_NOW;
+    bPlugDataSearched = 0;
+    pPlugData = 0;
+
+    aName = pContainer->GetName();
+    aName += DEFINE_CONST_UNICODE( ": " );
+    aName += aFilterName;
+
+    aUIName = aFilterName;
+}

where USHRT_MAX apparently effectively meant "arbitrarily large".  But when
b7c59605 "INTEGRATION: CWS sfxcleanup" removed
the WIN/OS2 special case it didn't remove all the other code that was now
effectively useless.

Change-Id: I883759f13e0267a189ad176c2ffcc1c78680b0a5
Reviewed-on: https://gerrit.libreoffice.org/48336Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>