Related: tdf#123291 treat overwrite like a selection of 1

for input into ImplTruncateToMaxLen like we do for the
following erase

Change-Id: I8cd02ff1ba76f61ddc614922068cbe2bc9bc4cb8
Reviewed-on: https://gerrit.libreoffice.org/69763
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/source/control/edit.cxx

@@ -793,13 +793,19 @@ void Edit::ImplInsertText( const OUString& rStr, const Selection* pNewSel, bool
     aSelection.Justify();
 
     OUString aNewText( ImplGetValidString( rStr ) );
-    ImplTruncateToMaxLen( aNewText, aSelection.Len() );
+
+    // as below, if there's no selection, but we're in overwrite mode and not beyond
+    // the end of the existing text then that's like a selection of 1
+    auto nSelectionLen = aSelection.Len();
+    if (!nSelectionLen && !mbInsertMode && aSelection.Max() < maText.getLength())
+        nSelectionLen = 1;
+    ImplTruncateToMaxLen( aNewText, nSelectionLen );
 
     ImplClearLayoutData();
 
     if ( aSelection.Len() )
         maText.remove( static_cast<sal_Int32>(aSelection.Min()), static_cast<sal_Int32>(aSelection.Len()) );
-    else if ( !mbInsertMode && (aSelection.Max() < maText.getLength()) )
+    else if (!mbInsertMode && aSelection.Max() < maText.getLength())
         maText.remove( static_cast<sal_Int32>(aSelection.Max()), 1 );
 
     // take care of input-sequence-checking now