Edge's rule chains - fix for card buttons

@@ -34,7 +34,7 @@
            class="md-raised md-primary">{{ 'rulechain.remove-default-edge' | translate }}</md-button>
 
 <md-button ng-click="onSetRootRuleChain({event: $event})"
-           ng-show="!isEdit && ruleChainsScope == 'edge'"
+           ng-show="!isEdit && ruleChainsScope == 'edge' && edge.rootRuleChainId.id !== ruleChain.id.id"
            class="md-raised md-primary">{{ 'rulechain.set-root' | translate }}</md-button>
 
 <md-button ng-click="onDeleteRuleChain({event: $event})"

@@ -41,6 +41,7 @@ export default function RuleChainDirective($compile, $templateCache, $mdDialog,
             isReadOnly: '=',
             theForm: '=',
             ruleChainsScope: '=',
+            edge: '=',
             onSetDefaultEdgeRuleChain: '&',
             onRemoveDefaultEdgeRuleChain: '&',
             onSetRootRuleChain: '&',

@@ -27,6 +27,7 @@
                      is-read-only="vm.grid.isDetailsReadOnly(vm.grid.operatingItem())"
                      the-form="vm.grid.detailsForm"
                      rule-chains-scope="vm.ruleChainsScope"
+                     edge="vm.edge"
                      on-set-default-edge-rule-chain="vm.setDefaultEdgeRuleChain(event, vm.grid.detailsConfig.currentItem)"
                      on-remove-default-edge-rule-chain="vm.removeDefaultEdgeRuleChain(event, vm.grid.detailsConfig.currentItem)"
                      on-set-root-rule-chain="vm.setRootRuleChain(event, vm.grid.detailsConfig.currentItem)"