GC with Image in unsupported use cases

Logging a warning for GC initialized with unsupported use cases.
1. all dynamic images (retrieved via any of the existing providers).
2. all images for which handles in other zoom values have already been
created.

Author: ShahzaibIbrahim

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

@@ -1743,6 +1743,14 @@ private ImageHandle init(ImageData i, int zoom) {
 @Override
 public long internal_new_GC (GCData data) {
 	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
+
+	if(imageProvider != null && (imageProvider instanceof ImageDataProviderWrapper || imageProvider instanceof ImageFileNameProviderWrapper)) {
+		System.err.println("***WARNING: Image initialized with ImageDataProvider or ImageFileNameProvider is not supposed to be modified");
+	}
+
+	if(zoomLevelToImageHandle != null && !zoomLevelToImageHandle.isEmpty()) {
+		System.err.println("**WARNING: Images with handles created for a different zoom level should not be modified.");
+	}
 	/*
 	* Create a new GC that can draw into the image.
 	* Only supported for bitmaps.