Updated review comments.

Author: deepika-u

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/TextLayout.java

@@ -2952,18 +2952,11 @@ StyleItem[] merge (long items, int itemCount) {
 			linkBefore = false;
 		}
 		char ch = segmentsText.charAt(start);
-		if(ch == '\r') {
+		if(ch == '\r' && (start+1 < end)) {
 			ch = segmentsText.charAt(start+1);
 		}
-		switch (ch) {
-			//case '\r':
-			case '\n':
-				item.lineBreak = true;
-				break;
-			case '\t':
-				item.tab = true;
-				break;
-		}
+		item.lineBreak = ch == '\n';
+		item.tab = ch == '\t';
 		if (itemLimit == -1) {
 			nextItemIndex = itemIndex + 1;
 			OS.MoveMemory(scriptItem, items + nextItemIndex * SCRIPT_ITEM.sizeof, SCRIPT_ITEM.sizeof);
@@ -3451,6 +3444,9 @@ public void setVerticalIndent (int verticalIndent) {
  */
 public void setStyle (TextStyle style, int start, int end) {
 	checkLayout();
+	int length = text.length();
+	if (length == 0) return;
+	if (start > end) return;
 	int countNextLine = 0, noStyleCountNextLine = 0, loop = 0;
 	if (previousEnd < 0)
 		loop = previousEnd+1;
@@ -3473,9 +3469,6 @@ public void setStyle (TextStyle style, int start, int end) {
 	}
 	previousEnd = end;
 	end = end - previousCountNextLine;
-	int length = text.length();
-	if (length == 0) return;
-	if (start > end) return;
 	start = Math.min(Math.max(0, start), length - 1);
 	end = Math.min(Math.max(0, end), length - 1);
 	int low = -1;