fix(chips): fixes issue where arrow keys switch active chip while edi…

…ting input field

src/components/chips/js/chipsController.js

@@ -83,22 +83,18 @@
    * @param event
    */
   MdChipsCtrl.prototype.inputKeydown = function(event) {
-    var chipBuffer;
+    var chipBuffer = this.getChipBuffer();
     switch (event.keyCode) {
       case this.$mdConstant.KEY_CODE.ENTER:
-        if (this.$scope.requireMatch) break;
-        chipBuffer = this.getChipBuffer();
-        if (chipBuffer) {
-          event.preventDefault();
-          this.appendChip(chipBuffer);
-          this.resetChipBuffer();
-        }
+        if (this.$scope.requireMatch || !chipBuffer) break;
+        event.preventDefault();
+        this.appendChip(chipBuffer);
+        this.resetChipBuffer();
         break;
       case this.$mdConstant.KEY_CODE.BACKSPACE:
-        if (!event.target.value.length) {
-          event.stopPropagation();
-          if (this.items.length) this.selectAndFocusChipSafe(this.items.length - 1);
-        }
+        if (chipBuffer) break;
+        event.stopPropagation();
+        if (this.items.length) this.selectAndFocusChipSafe(this.items.length - 1);
         break;
     }
   };
@@ -109,6 +105,7 @@
    * @param event
    */
   MdChipsCtrl.prototype.chipKeydown = function (event) {
+    if (this.getChipBuffer()) return;
     switch (event.keyCode) {
       case this.$mdConstant.KEY_CODE.BACKSPACE:
       case this.$mdConstant.KEY_CODE.DELETE: