Relative option for the blur node only applied when the UI updated.

This meant that changing the image size later on would still use the old size.

Set the relative blur size when executing the node too.

source/blender/nodes/intern/CMP_nodes/CMP_blur.c

@@ -567,6 +567,11 @@ static void node_composit_exec_blur(void *data, bNode *node, bNodeStack **in, bN
 	
 	if(out[0]->hasoutput==0) return;
 	
+	if(nbd->relative) {
+		nbd->sizex= (int)(nbd->percentx*nbd->image_in_width);
+		nbd->sizey= (int)(nbd->percenty*nbd->image_in_height);
+	}
+
 	if (((NodeBlurData *)node->storage)->filtertype == R_FILTER_FAST_GAUSS) {
 		CompBuf *new, *img = in[0]->data;
 		/*from eeshlo's original patch, removed to fit in with the existing blur node */