Graph Editor : Support Token Editing

[kwokcb]

Scope

This is the second part for token support

• Allow for token inputs to be editable.
• This should trigger any nodes with image filename inputs to trigger a "drity" to force a re-render
• Optional: Add in a "Show all tokens" option to hide / show nodedef tokens

Being editable probably means that the structure of a UI node needs to have members to hold persistent token "pin" data similar to input pins.

As a clarifying point this does not entail being able to add or remove tokens the way you can add and remove inputs / outputs. i.e. you can only edit existing tokens. This could be a part 3 :).

[mialana]

Hello. It is quite late but is it possible to pick this issue up for Dev Days? I am willing to continue working on it after the official hackathon as well!

I contributed to MaterialX in Dev Days 2025 and wanted to contribute as much as I could again this year despite being a bit busier (it is the middle of graduation week right now for me)!

[jstone-lucasfilm]

Not too late at all, @mialana, and we'd be more than happy to have you return this year! I've assigned you to this task for Dev Days.

[mialana]

Thank you @jstone-lucasfilm! I will get right to work then.

[kwokcb]

Ping if you need anything, either here or on Slack (faster).

[jstone-lucasfilm]

Thanks to @kwokcb for this original proposal, as well as to @mialana for implementing it in #2943.