Fix enlarging for paste

Fix warning dialog "History node switched during undoable callback for Paste: Enlarge. This shouldn't happen."

Don't do an undoable inside an undoable.

src/functions.js

@@ -820,9 +820,10 @@ function paste(img){
 					ctx.fillRect(0, 0, canvas.width, canvas.height);
 				}
 				ctx.putImageData(original, 0, 0);
+			});
+			// (undoable callback is synchronous, so this runs after it)
 			do_the_paste();
 			$canvas_area.trigger("resize");
-			});
 		})[0].focus();
 		$w.$Button("Crop", () => {
 			$w.close();