Probes do not update value when components are pushed away from them

[phet-steele]

1. Set up a short with two wires and a battery (this isn't the only possible setup, but I had to tell you to set something up!)
2. Drag the wire connection out so you've made a triangle shape with decently long side lengths, like this:

3. Place the ammeter probe just on the inner edge of a wire, like this:

4. Cut the wire-wire connection! The ammeter will correctly be reading 0.00 A....but it shouldn't be reading anything at all! It isn't anywhere near the wire's hit area. Wiggle the other wire to "update" the probe to the correct readout.

(after wiggling the right wire)

5. Go back to the setup in step 2. Place a voltmeter probe on a battery terminal and the other at the wire-wire connection, like this:

6. Cut the wire-wire connection! Same story with the correct value being read, but there shouldn't be a value at all. Wiggle the battery to "update" the readout.

(after wiggling the battery)

Seen on macOS 10.12.6 Chrome. For phetsims/qa/issues/51.

URL: http://www.colorado.edu/physics/phet/dev/html/circuit-construction-kit-dc/1.0.0-dev.162/circuit-construction-kit-dc_en.html
Version: 1.0.0-dev.162 2017-09-19 15:30:35 UTC
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[samreid]

Cut calls Circuit.solve which calls circuitChangedEmitter.emit, which updates the values in the node. But perhaps something is out of sync? AmmeterNode uses Node.hitTest which I thought would be synchronous, but perhaps we have to wait for a display.update?

[samreid]

Good one @phet-steele, can you please test the fix committed above?

[samreid]

Dev version is available here: http://www.colorado.edu/physics/phet/dev/html/circuit-construction-kit-dc/1.0.0-dev.163/circuit-construction-kit-dc_en.html

[phet-steele]

Cool fix, thanks @samreid.