Propagate "updateOneTimeBindings" to if.

Fixes aurelia#356

src/if-core.ts

@@ -1,4 +1,5 @@
 import { ViewFactory, ViewSlot } from 'aurelia-templating';
+import { updateBindings } from './repeat-utilities';
 
 /**
  * For internal use only. May change without warning.
@@ -52,6 +53,12 @@ export class IfCore {
     this.overrideContext = overrideContext;
   }
 
+  updateOneTimeBindings() {
+    if (this.view && this.view.isBound) {
+      updateBindings(this.view);
+    }
+  }
+
   unbind() {
     if (this.view === null) {
       return;

src/repeat-utilities.ts

@@ -104,6 +104,29 @@ export function isOneTime(expression) {
   return false;
 }
 
+/**
+ * Forces all one-time bindings in that view to reevaluate.
+ */
+export function updateBindings(view) {
+  const $view = view as View & { bindings: any[]; controllers: any[] };
+  let j = $view.bindings.length;
+  while (j--) {
+    updateOneTimeBinding($view.bindings[j]);
+  }
+  j = $view.controllers.length;
+  while (j--) {
+    let k = $view.controllers[j].boundProperties.length;
+    while (k--) {
+      if ($view.controllers[j].viewModel && $view.controllers[j].viewModel.updateOneTimeBindings) {
+        $view.controllers[j].viewModel.updateOneTimeBindings();
+      }
+      let binding = $view.controllers[j].boundProperties[k].binding;
+      updateOneTimeBinding(binding);
+    }
+  }
+}
+
+
 /**
  * Forces a binding instance to reevaluate.
  */

src/repeat.ts

@@ -17,7 +17,7 @@ import {
   getItemsSourceExpression,
   unwrapExpression,
   isOneTime,
-  updateOneTimeBinding
+  updateBindings
 } from './repeat-utilities';
 import {viewsRequireLifecycle} from './analyze-view-factory';
 import {AbstractRepeater} from './abstract-repeater';
@@ -343,19 +343,7 @@ export class Repeat extends AbstractRepeater {
   }
 
   updateBindings(view: View) {
-    const $view = view as View & { bindings: any[]; controllers: any[] };
-    let j = $view.bindings.length;
-    while (j--) {
-      updateOneTimeBinding($view.bindings[j]);
-    }
-    j = $view.controllers.length;
-    while (j--) {
-      let k = $view.controllers[j].boundProperties.length;
-      while (k--) {
-        let binding = $view.controllers[j].boundProperties[k].binding;
-        updateOneTimeBinding(binding);
-      }
-    }
+    updateBindings(view);
   }
 }