discourse/patches/virtual-dom+2.1.1.patch

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diff --git a/node_modules/virtual-dom/vtree/diff.js b/node_modules/virtual-dom/vtree/diff.js
index b5bccbd..058d6b3 100644
--- a/node_modules/virtual-dom/vtree/diff.js
+++ b/node_modules/virtual-dom/vtree/diff.js
@@ -311,6 +311,38 @@ function reorder(aChildren, bChildren) {
var inserts = []
var simulateItem
+ // handle prepends without reordering old elements
+ var shift = bChildren.length - aChildren.length
+ if (shift > 0 && simulate.length === bChildren.length) {
+ var prepend = true
+ for (var i = 0; prepend && i < simulate.length; i++) {
+ prepend = simulate[i] && simulate[i].key
+ }
+ for (var i = 0; prepend && i < aChildren.length; i++) {
+ prepend = aChildren[i].key === bChildren[i + shift].key
+ }
+
+ if (prepend) {
+ for (var i = 0; i < shift; i++) {
+ removes.push({
+ from: aChildren.length,
+ key: bChildren[i].key
+ })
+ inserts.push({
+ to: i,
+ key: bChildren[i].key
+ })
+ }
+ return {
+ children: newChildren,
+ moves: {
+ removes: removes,
+ inserts: inserts
+ }
+ }
+ }
+ }
+
for (var k = 0; k < bChildren.length;) {
var wantedItem = bChildren[k]
simulateItem = simulate[simulateIndex]