Don't step SyntaxElementMorphs or their children

~1500 ms before => ~150 ms after (stepping world with large scripts)

1 files changed, 4 insertions, 0 deletions

diff --git a/blocks.js b/blocks.js
index d373cea..d2a395a 100644
--- a/blocks.js
+++ b/blocks.js
@@ -621,6 +621,10 @@ SyntaxElementMorph.prototype.topBlock = function () {
     return this;
 };
 
+// SyntaxElementMorph stepping:
+
+SyntaxElementMorph.prototype.step = null;
+
 // SyntaxElementMorph drag & drop:
 
 SyntaxElementMorph.prototype.reactToGrabOf = function (grabbedMorph) {