property-changed not sent from data binding

[mkropf]

Description

a polymer element fires a -changed event when a property is declared with notify: true and is "observably changed". However, when the property is changed from a data binding, the event is not fired.

This is very surprising, it is not understandable why a property change should behave differently, depending on the way it gets invoked.

Live Demo

https://jsbin.com/fiqisay/edit?html,output

Steps to Reproduce

run the example in jsbin

Expected Results

both child properties should notify

Actual Results

the property updated by the binding doesn't

Browsers Affected

• [x ] Chrome
• [x ] Firefox
• [? ] Edge
• [? ] Safari 11
• [? ] Safari 10
• [? ] IE 11

Versions

• Polymer: v3.4.1
• webcomponents: vX.X.X

[mkropf]

should _setPendingProperty be called with 3d parameter true?

polymer/lib/mixins/property-effects.js

Line 820 in 8bd4b6e

if (node._setPendingProperty(prop, value)) {

[stale]

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