Stackoverflow fix in ImageDescriptor

Fixes getImageData(100) calling itself endlessly (introduced via
c2fe144
) by reintroducing the bigger getImageData(100) and getImageData()
endlessly (introduced in 2017 via
e6d12ca
) that wasn't experienced thanks to the *happy accident* that it was
asbtract method and all implementations before that had their own and
every implementor since then most likely figured the endless loop while
developing.
Enhanced documentation to mention that.

Author: akurtakov

bundles/org.eclipse.jface/src/org/eclipse/jface/resource/ImageDescriptor.java

@@ -430,24 +430,26 @@ public ImageData getImageData(int zoom) {
 	}
 
 	/**
-	 * Creates and returns a new SWT <code>ImageData</code> object
-	 * for this image descriptor.
-	 * Note that each call returns a new SWT image data object.
+	 * Creates and returns a new SWT <code>ImageData</code> object for this image
+	 * descriptor. Note that each call returns a new SWT image data object.
 	 * <p>
-	 * This framework method is declared public so that it is
-	 * possible to request an image descriptor's image data without
-	 * creating an SWT image object.
+	 * This framework method is declared public so that it is possible to request an
+	 * image descriptor's image data without creating an SWT image object.
 	 * </p>
 	 * <p>
 	 * Returns <code>null</code> if the image data could not be created.
 	 * </p>
 	 * <p>
-	 * This method was abstract until 3.13. Clients should stop re-implementing
-	 * this method and should re-implement {@link #getImageData(int)} instead.
+	 * This method was abstract until 3.13. Clients should stop re-implementing this
+	 * method and should re-implement {@link #getImageData(int)} instead.
 	 * </p>
 	 *
 	 * @return a new image data or <code>null</code>
-	 * @deprecated Use {@link #getImageData(int)} instead.
+	 * @deprecated Use {@link #getImageData(int)} instead. <b>Note: Calling this
+	 *             method may result in stack overflow if subclass doesn't override
+	 *             either {@link #getImageData()} or {@link #getImageData(int)} to
+	 *             prevent endless cycle between the 2 implementation in this class
+	 *             since 2017.</b>
 	 */
 	@Deprecated
 	public ImageData getImageData() {