Remove unused drawBorder() method in CTabFolderRenderer

The drawBorder(GC, int[]) method that drew polyline-based tab borders
is no longer called anywhere. Remove it as dead code.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

bundles/org.eclipse.swt/Eclipse SWT Custom Widgets/common/org/eclipse/swt/custom/CTabFolderRenderer.java

@@ -594,15 +594,6 @@ void drawBackground(GC gc, int[] shape, int x, int y, int width, int height, Col
 		}
 	}
 
-	/*
-	 * Draw the border of the tab
-	 */
-	void drawBorder(GC gc, int[] shape) {
-
-		gc.setForeground(parent.getDisplay().getSystemColor(BORDER1_COLOR));
-		gc.drawPolyline(shape);
-	}
-
 	void drawBody(GC gc, Rectangle bounds, int state) {
 		Point size = new Point(bounds.width, bounds.height);
 		int selectedIndex = parent.selectedIndex;