Resolves fdo#87968 : Assertion failed: false rtl_uString_newFromSubString

aNewText already contains the good string so calling copy method is wrong
(same pb for i18n::TransliterationModulesExtra::TITLE_CASE and
i18n::TransliterationModulesExtra::SENTENCE_CASE)

Change-Id: Ifce92f33e98af3a58a70d25da9c60cf3d584a001
Reviewed-on: https://gerrit.libreoffice.org/13724Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

editeng/source/editeng/impedit4.cxx

@@ -2818,7 +2818,7 @@ EditSelection ImpEditEngine::TransliterateText( const EditSelection& rSelection,
                         GetLanguage( EditPaM( pNode, nCurrentStart + 1 ) ),
                         nCurrentStart, nLen, &aOffsets ));
 
-                if (aNodeStr != aNewText.copy( nCurrentStart, nLen ))
+                if (aNodeStr != aNewText)
                 {
                     aChgData.nStart     = nCurrentStart;
                     aChgData.nLen       = nLen;
@@ -2906,7 +2906,7 @@ EditSelection ImpEditEngine::TransliterateText( const EditSelection& rSelection,
                         GetLanguage( EditPaM( pNode, nCurrentStart + 1 ) ),
                         nCurrentStart, nLen, &aOffsets ));
 
-                if ( aNodeStr != aNewText.copy( nCurrentStart, nLen ))
+                if (aNodeStr != aNewText)
                 {
                     aChgData.nStart     = nCurrentStart;
                     aChgData.nLen       = nLen;
@@ -2944,7 +2944,7 @@ EditSelection ImpEditEngine::TransliterateText( const EditSelection& rSelection,
                 Sequence< sal_Int32 > aOffsets;
                 OUString aNewText( aTransliterationWrapper.transliterate( aNodeStr, nLanguage, nCurrentStart, nLen, &aOffsets ) );
 
-                if (aNodeStr != aNewText.copy( nCurrentStart, nLen ))
+                if (aNodeStr != aNewText)
                 {
                     aChgData.nStart     = nCurrentStart;
                     aChgData.nLen       = nLen;