[texworks] Artifacts in scroll-down menus on Mac OS X 10.6

[Bruno Voisin]

Artifacts are visible near the top and bottom of scroll-down menus  
with v404 on Mac OS X 10.6 (Snow Leopard). They may have been there  
before, I don't remember.

Examples with the "binary" menu in the toolbar:

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interface locale in the General prefs

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syntax coloring in the Editor prefs

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default processing tool in the Typesetting prefs

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The exact form of the artifact varies each time the menu is shown,  
even within a single TeXworks session.

Bruno Voisin