improve performance for class-only changes; improves #40 but doesn't fix the real underlying combinatorial explosion

karax/compact.nim

@@ -93,7 +93,7 @@ when defined(js):
     n[0] = ident("inner" & nn)
     var unpackCall = newCall(n[0])
     var counter = 0
-    for i in 1.. <params.len:
+    for i in 1 ..< params.len:
       let param = params[i]
       let L = param.len
       let typ = param[L-2]

karax/karax.nim

@@ -245,10 +245,10 @@ proc eq(a, b: VNode): EqResult =
       when defined(profileKarax): inc reasons[deComponent]
       return different
     return componentsIdentical
-  if a.class != b.class:
-    when defined(profileKarax): inc reasons[deClass]
-    return different
-  if not eq(a.style, b.style) or not sameAttrs(a, b):
+  #if:
+  #  when defined(profileKarax): inc reasons[deClass]
+  #  return different
+  if a.class != b.class or not eq(a.style, b.style) or not sameAttrs(a, b):
     when defined(profileKarax): inc reasons[deSimilar]
     return similar
   # Do not test event listeners here!
@@ -260,6 +260,7 @@ proc updateStyles(newNode, oldNode: VNode) =
     if newNode.style != nil: applyStyle(oldNode.dom, newNode.style)
     else: oldNode.dom.style = Style()
   oldNode.style = newNode.style
+  oldNode.class = newNode.class
 
 proc updateAttributes(newNode, oldNode: VNode) =
   # we keep the oldNode, but take over the attributes from the new node: