Pan-and-Zoom feature is not working with PhET "Creator" pattern.

[pixelzoom]

Creator is a PhET design pattern used by toolboxes and buckets. When something is dragged out of a toolbox or bucket, a new object is created, with a corresponding model and view. As discovered in phetsims/equality-explorer#179 (comment), if the simulation is zoomed in, then panning does not work while dragging the newly-created object.

In phetsims/equality-explorer#179 (comment), @jessegreenberg confirmed that this is a general problem, and said:

I would have expected it to keep the Node in view here. Pan and Zoom is not handling the creator pattern well, that is why it doesn't work when you pull out a term from the toolbar but does work for subsequent drags. It is not sim specific. ...

In phetsims/equality-explorer#179 (comment), @KatieWoe also confirmed that this is a general problem, occuring in "a number of sims on master" and "is in phetsims/qa#736 as well".

Assigned to @jessegreenberg to investigate. Please check with @kathy-phet and @amanda-phet for priority.

[pixelzoom]

From phetsims/equality-explorer#179 (comment), this shows the buggy behavior:

[KatieWoe]

Noting in phetsims/qa#748

[pixelzoom]

This will likely be a problem for geometric-optics, where we drag rulers out of a toolbox.

[Nancy-Salpepi]

When testing phetsims/qa#771, I noticed that pan-and-zoom works when moving an object around the play area. However, if I were to remove an object from a grouping, it will not pan until I release it and grab it again. Also, panning won't happen when an object is initially removed from bucket.

[jessegreenberg]

The overall approach to panning while dragging an object is pretty poor. I am going to reconsider it here first phetsims/scenery#1356 before trying to get what we currently have working with the "Creator" pattern.

[Nancy-Salpepi]

Noting that I'm seeing this issue while testing phetsims/qa#785.
For example, panning doesn't occur after removing an element from the carousel in CCK .

[samreid]

@jessegreenberg can you please comment on the state of this issue now that phetsims/scenery#1356 is closed?

[jessegreenberg]

I just confirmed that cases like phetsims/build-a-nucleus#23 are not fixed so we still need to solve that. But hopefully it will be easier now that phetsims/scenery#1356 is done.

[Luisav1]

Build a Nucleus is getting ready for publication, it'd be nice to take a look at this issue. @jessegreenberg, @zepumph and I would be happy to help.

[jessegreenberg]

Pan and zoom is working well in BAN with changes from phetsims/scenery#1356 once the targetNode is set on the DragListener for the forwarded event. I will see if that is the case for CCK as well (#769 (comment))

[jessegreenberg]

The issue in CCK is caused by phetsims/circuit-construction-kit-common#992, a sim specific issue. Since this pattern has been well supported for a while and the remaining sim specific cases are handled, this issue can be closed.