Fix bug 57828, shifting more than one commit per row did not work.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1674975 13f79535-47bb-0310-9956-ffa450edef68

src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFSheet.java

@@ -2596,11 +2596,13 @@ public class XSSFSheet extends POIXMLDocumentPart implements Sheet {
         // i.e. when shifting down, start from down and go up, when shifting up, vice-versa
         SortedMap<XSSFComment, Integer> commentsToShift = new TreeMap<XSSFComment, Integer>(new Comparator<XSSFComment>() {
 			public int compare(XSSFComment o1, XSSFComment o2) {
-				int row1 = new CellReference(o1.getCTComment().getRef()).getRow();
-				int row2 = new CellReference(o2.getCTComment().getRef()).getRow();
+				int row1 = o1.getRow();
+				int row2 = o2.getRow();
 				
 				if(row1 == row2) {
-					return 0;
+					// ordering is not important when row is equal, but don't return zero to still 
+					// get multiple comments per row into the map
+					return o1.hashCode() - o2.hashCode();
 				}
 
 				// when shifting down, sort higher row-values first

src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFSheetShiftRows.java

@@ -332,4 +332,38 @@ public final class TestXSSFSheetShiftRows extends BaseTestSheetShiftRows {
             wb.removeSheetAt(sn);
         }
     }
+
+    public void testBug57828_OnlyOneCommentShiftedInRow() throws IOException {
+        XSSFWorkbook wb = XSSFTestDataSamples.openSampleWorkbook("57828.xlsx");
+        XSSFSheet sheet = wb.getSheetAt(0);
+
+        Comment comment1 = sheet.getCellComment(2, 1);
+        assertNotNull(comment1);
+
+        Comment comment2 = sheet.getCellComment(2, 2);
+        assertNotNull(comment2);
+
+        Comment comment3 = sheet.getCellComment(1, 1);
+        assertNull("NO comment in (1,1) and it should be null", comment3);
+
+        sheet.shiftRows(2, 2, -1);
+
+        comment3 = sheet.getCellComment(1, 1);
+        assertNotNull("Comment in (2,1) moved to (1,1) so its not null now.", comment3);
+
+        comment1 = sheet.getCellComment(2, 1);
+        assertNull("No comment currently in (2,1) and hence it is null", comment1);
+
+        comment2 = sheet.getCellComment(1, 2);
+        assertNotNull("Comment in (2,2) should have moved as well because of shift rows. But its not", comment2);
+        
+//        OutputStream stream = new FileOutputStream("/tmp/57828.xlsx");
+//        try {
+//        	wb.write(stream);
+//        } finally {
+//        	stream.close();
+//        }
+        
+        wb.close();
+    }
 }