Intermediate variables are shown in flyout while procedure mutator field is being edited

[gonfunko]

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Description

If you add an input to a procedure and rename it, the variables category in the flyout will display variables for each keystroke until the input field in the mutator bubble loses focus, at which point the intermediate variables disappear and only the variable corresponding to the input's final name remains.

Reproduction steps

1. Drag out a procedure block
2. Open its mutator
3. Add a new input
4. Rename the input
5. While the input name field still has focus in the mutator bubble, open the Variables category of the toolbox
6. Observe that variables corresponding to each keystroke are present
7. Click outside of the input name field in the mutator bubble to cause it to lose focus
8. Reopen the Variables category, and observe that the intermediate state variables are gone, leaving only one corresponding to the final name of the input

Stack trace

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No response

[cpcallen]

When checking any fix for this, do test (or better still: add tests) to see what happens if one of the intermediate variable names clashes with another variable/parameter—e.g., if there is a variable foo and you rename a parameter from f to food.