Polymer app silently reloads without any error log or exception.

[DartBot]

Originally opened as dart-lang/sdk#20228

This issue was originally filed by @giry

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What steps will reproduce the problem?
One of my projects works well with polymer 0.9.5 package but when I upgrade to 0.11.0+5 app started to reload after particular action (more precisely: after creation of second WebSocket connection - that is probably unimportant). Here is stacktrace of last place where I can put breakpoint:
MapServers.onGameInitResp() <-- last place im my code
_RootZone.runUnaryGuarded()
_BufferingStreamSubscription._sendData()
_DelayedData.perform()
_StreamImplEvents.handleNext()
_PendingEvents.<anonymous closure>()
_asyncRunCallbackLoop()
_asyncRunCallback()
_ScheduleImmediateHelper._handleMutation()

I can just use debugger and go step by step to _ScheduleImmediateHelper._handleMutation() and after it page just reloads.

When I set "Break on exceptions: all" in DartEditor settings - nothing happens - page still just silently reloads. When I select also "break on JavaScript exceptions" app stops in platform.concat.js on line 899 before app appears on screen (with SyntaxError):

  var hasDebugForceFullDelivery = hasObserve && (function() {
    try {
      eval('%RunMicrotasks()'); <--- here
      return true;
    } catch (ex) {
      return false;
    }
  })();

I can catch exception in platform.concat.js also in any other polymer app that I have in workspace (also sample polymer app created by File->New Project) so I guess this might be normal behaviour.
 

What version of the product are you using?
Dart Editor version 1.6.0.dev_04_00 (DEV)
Dart SDK version 1.6.0-dev.4.0
polymer 0.11.0+5

On what operating system?
Windows 8.1

What browser (if applicable)?
Dartium 36.0.1985.97 (282401)

[DartBot]

<img src="https://avatars.githubusercontent.com/u/5479?v=3" align="left" width="48" height="48"hspace="10"> Comment by sethladd

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Added Pkg-Polymer, Area-Pkg, Triaged labels.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2049220?v=3" align="left" width="48" height="48"hspace="10"> Comment by sigmundch

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Thanks for the bug report.

Yeah - the exception from platform is normal, so you can safely ignore it.

It might be an issue that is very specific to your application, so it's hard to guess. Could you include a code example for us? We basically need a small example (it could be a single file) that we can run to reproduce the problem here.
 
Thanks!

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Removed Priority-Unassigned label.
Added Priority-Medium, PolymerMilestone-Next, NeedsInfo labels.

[DartBot]

This comment was originally written by @giry

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I find out that the issue was caused by https://code.google.com/p/dart/issues/detail?id=20034

[DartBot]

<img src="https://avatars.githubusercontent.com/u/984921?v=3" align="left" width="48" height="48"hspace="10"> Comment by jakemac53

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Closing this then in preference of Polymer/polymer#672. You can use the _href="{{'#'}}" hack to work around this for now.

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Added MovedToGithub label.