// finds the first nearest text range
 @Nullable("null means invalid")
 private static TextRange findNearestTextRange(
     final DocumentWindow documentWindow, final int startOffset) {
   TextRange textRange = null;
   for (Segment marker : documentWindow.getHostRanges()) {
     TextRange curRange = ProperTextRange.create(marker);
     if (curRange.getStartOffset() > startOffset && textRange != null) break;
     textRange = curRange;
   }
   return textRange;
 }
 // finds the first nearest text range
 private static TextRange findNearestTextRange(
     final DocumentWindow documentWindow, final int startOffset) {
   TextRange textRange = null;
   for (RangeMarker marker : documentWindow.getHostRanges()) {
     TextRange curRange = ProperTextRange.create(marker);
     if (curRange.getStartOffset() > startOffset && textRange != null) break;
     textRange = curRange;
   }
   assert textRange != null;
   return textRange;
 }