Add special flag to auto-inserted Ext4 event param.

By using just the name "eOpts" we can't really be sure if the
parameter was auto-inserted or manually added by user.

lib/jsduck/process/ext4_events.rb

@@ -34,7 +34,8 @@ module JsDuck
         :tagname => :params,
         :name => "eOpts",
         :type => "Object",
-        :doc => "The options object passed to {@link Ext.util.Observable#addListener}."
+        :doc => "The options object passed to {@link Ext.util.Observable#addListener}.",
+        :ext4_auto_param => true,
       }
 
     end

lib/jsduck/process/inherit_members.rb

@@ -92,8 +92,8 @@ module JsDuck
       end
 
       def inherit_params?(m, parent)
-        # ignore the eOpts auto-inserted param of Ext4-style events
-        params = (m[:params] || []).reject {|p| p[:name] == "eOpts" }
+        # ignore the auto-inserted param of Ext4-style events
+        params = (m[:params] || []).reject {|p| p[:ext4_auto_param] }
 
         if params.length > 0 && !auto?(m, :params)
           # member itself has params and these are not auto-detected

spec/aggregator_ext4_events_spec.rb

@@ -34,6 +34,10 @@ describe JsDuck::Aggregator do
     it "with standard description" do
       event[:params][2][:doc].should =~ /The options object passed to.*addListener/
     end
+
+    it "with special :ext4event flag" do
+      event[:params][2][:ext4_auto_param].should == true
+    end
   end
 
   describe "When some class defined with Ext.define" do