Don't scroll to caret when stepping.

src/components/editor/CaretView.svelte

@@ -206,9 +206,9 @@
         });
     });
 
-    // When caret location or view changes, tick, then scroll to it.
+    // When caret location or view changes and not playing, tick, then scroll to it.
     $effect(() => {
-        if (location && element)
+        if (location && element && $evaluation.playing)
             tick().then(() => {
                 if (element) element.scrollIntoView({ block: 'nearest' });
             });

src/components/editor/Editor.svelte

@@ -278,11 +278,13 @@
         // If the program contains this node, scroll it's first token into view.
         const stepNode = evaluator.getStepNode();
         if (stepNode && source.has(stepNode)) {
-            // Wait for everything to render, then find the node to scroll to.
+            // Wait for everything to render...
             await tick();
+
+            // Then find the node to scroll to. Keep searching for a visible node,
+            // in case the step node is invisible.
             let highlight: Node | undefined = stepNode;
             let element = null;
-            // Keep searching for a visible node, in case the step node is invisible.
             do {
                 element = document.querySelector(`[data-id="${highlight.id}"]`);
                 if (element !== null) break;