Only select right clicked WP row

app/assets/javascripts/angular/services/work-packages-table-service.js

@@ -131,6 +131,11 @@ angular.module('openproject.workPackages.services')
       });
     },
 
+    setCheckedStateForAllRows: function(rows, state) {
+      angular.forEach(rows, function(row) {
+        row.checked = state;
+      });
+    },
     setRowSelection: function(row, state) {
       row.checked = state;
     },

app/assets/javascripts/angular/work_packages/directives/work-packages-table-directive.js

@@ -79,9 +79,7 @@ angular.module('openproject.workPackages.directives')
       });
 
       scope.setCheckedStateForAllRows = function(state) {
-        angular.forEach(scope.rows, function(row) {
-          row.checked = state;
-        });
+        WorkPackagesTableService.setCheckedStateForAllRows(scope.rows, state);
       };
 
       var groupableColumns = WorkPackagesTableService.getGroupableColumns();

app/assets/javascripts/angular/work_packages/work-package-context-menu.js

@@ -55,6 +55,7 @@ angular.module('openproject.workPackages')
   $scope.hideResourceActions = true;
 
   $scope.$watch('row', function() {
+    WorkPackagesTableService.setCheckedStateForAllRows($scope.rows, false);
     $scope.row.checked = true;
     $scope.permittedActions = WorkPackageContextMenuHelper.getPermittedActions(getSelectedWorkPackages());
   });