Propagate "updateOneTimeBindings" to if.

Fixes aurelia#356

src/if-core.js

@@ -1,3 +1,5 @@
+import { updateBindings } from './repeat-utilities';
+
 /**
 * For internal use only. May change without warning.
 */
@@ -20,6 +22,12 @@ 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.js

@@ -103,6 +103,28 @@ export function isOneTime(expression) {
   return false;
 }
 
+/**
+* Forces all one-time bindings in that view to reevaluate.
+*/
+export function updateBindings(view) {
+  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.js

@@ -15,7 +15,7 @@ import {
   getItemsSourceExpression,
   unwrapExpression,
   isOneTime,
-  updateOneTimeBinding
+  updateBindings
 } from './repeat-utilities';
 import {viewsRequireLifecycle} from './analyze-view-factory';
 import {AbstractRepeater} from './abstract-repeater';
@@ -270,17 +270,6 @@ export class Repeat extends AbstractRepeater {
   }
 
   updateBindings(view: View) {
-    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);
   }
 }