Fix minor graphical editor issues.

[philip-alldredge]

Fix case where connections appear behind shapes.
Minor addition to transient view API.
Fix event data port label in prototype bindings dialog.

@lwrage this fixes a few issues that I came across recently. I noticed that the prototype binding test is failing because the event data port port category is getting serialized as eventData port. This does not fix that.

[philip-alldredge]

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- Philip Alldredge

[sonarqubecloud]

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