yocto_console_view: Handle change notification performance issues

The previous approach was basically repeatedly adding change nofification
calls recursively which could lock up the browser. It turns out nofitications
are not being generated properly in upstream buildbot.

https://github.com/buildbot/buildbot/issues/4321
https://github.com/buildbot/buildbot/pull/4323

For now accept a UI regression which will get fixed when the above is
fixed. Avoid the current performance problems.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

yocto_console_view/src/module/main.module.coffee

@@ -87,16 +87,15 @@ class Console extends Controller
 
         @builds.onChange = @changes.onChange = @buildrequests.onChange = @buildsets.onChange = @onChange
 
-        @dataAccessor.getBuilds().onChange = (builds) =>
-            for b in builds
-                b.getProperties().onChange = (properties) =>
-                    buildid = properties.endpoint.split('/')[1]
-                    if ! @maping[buildid]
-                        rev = @getBuildProperty(properties[0], 'yp_build_revision')
-                        if rev?
-                            @maping[buildid] = rev
-                            if not @onchange_debounce?
-                                @onchange_debounce = @$timeout(@_onChange, 100)
+        @builds.onNew = (build) =>
+            build.getProperties().onChange = (properties) =>
+                buildid = properties.endpoint.split('/')[1]
+                if ! @maping[buildid]
+                    rev = @getBuildProperty(properties[0], 'yp_build_revision')
+                    if rev?
+                        @maping[buildid] = rev
+                        if not @onchange_debounce?
+                            @onchange_debounce = @$timeout(@_onChange, 100)
 
     getBuildProperty: (properties, property) ->
         hasProperty = properties && properties.hasOwnProperty(property)