fix(Filter): Watch running w/o change check

The filter term watches were all firing whether or not there was a change
to the values!

Author: c0bra

src/features/edit/js/gridEdit.js

@@ -549,7 +549,6 @@
 
               var cellElement;
               $scope.$apply(function () {
-                debugger;
                 inEdit = true;
                 cancelBeginEditEvents();
                 var cellElement = angular.element(html);
@@ -677,8 +676,6 @@
                 });
 
                 $elm.on('keydown', function (evt) {
-                  // debugger;
-
                   switch (evt.keyCode) {
                     case uiGridConstants.keymap.ESC:
                       evt.stopPropagation();

src/js/core/directives/ui-grid-header-cell.js

@@ -213,14 +213,16 @@
               var filterDeregisters = [];
               angular.forEach($scope.col.filters, function(filter, i) {
                 filterDeregisters.push($scope.$watch('col.filters[' + i + '].term', function(n, o) {
-                  uiGridCtrl.grid.api.core.raise.filterChanged();
-                  uiGridCtrl.grid.refresh()
-                    .then(function () {
-                      if (uiGridCtrl.prevScrollArgs && uiGridCtrl.prevScrollArgs.y && uiGridCtrl.prevScrollArgs.y.percentage) {
-                         uiGridCtrl.fireScrollingEvent({ y: { percentage: uiGridCtrl.prevScrollArgs.y.percentage } });
-                      }
-                      // uiGridCtrl.fireEvent('force-vertical-scroll');
-                    });
+                  if (n !== o) {
+                    uiGridCtrl.grid.api.core.raise.filterChanged();
+                    uiGridCtrl.grid.refresh()
+                      .then(function () {
+                        if (uiGridCtrl.prevScrollArgs && uiGridCtrl.prevScrollArgs.y && uiGridCtrl.prevScrollArgs.y.percentage) {
+                           uiGridCtrl.fireScrollingEvent({ y: { percentage: uiGridCtrl.prevScrollArgs.y.percentage } });
+                        }
+                        // uiGridCtrl.fireEvent('force-vertical-scroll');
+                      });
+                  }
                 }));  
               });
               $scope.$on('$destroy', function() {