Bug Report: Filter Editor panning sticks

Description: In the Filter Editor, when using a component with a list box and holding the space bar causes the editing area to switch to and stick in Pan mode.

Failure: Minor Annoyance

Steps to Reproduce:
Open Filter Editor (choose New Filter)
Drag out an External > Image component
Drag out a Noise > Blocks component
Connect Image to Noise Source, then Noise to Result
Select Noise Component
In the controls area, click on the Formula list box to highlight it
Hold down Space Bar for at least a few seconds, until the box begins to 'blink'
Click in layout area

Actual Result: Pan mode is enabled (similar to holding down space bar continuously). Selecting Zoom or Select tools highlights the icons, but does not switch modes.

Expected Result: Tools can be switched as normal.

Workarounds: Closing the filter and reopening clears the problem.

Notes: This appears to work for any component with a list box; holding down the space bar causes the list box to 'stick' the space bar key.

Sorry - haven't been able to get back to this (shameless plug: my new book just shipped), but plan to apply some energy tonight. I'll report back, soon.