[NETBEANS-5696] HiDPI-scalable "spinner" icon for window system tabs #2966
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The window system tabs component has a spinning "busy" icon which is displayed e.g. while the Navigator is initially loading. This issue's Pull Request replaces the current bitmap-based icon (busy_icon.png) with a scalable spinner graphic (drawn with Java2D code) that looks better on HiDPI/Retina screens. This benefits all LAFs. Screenshot attached below.
The spinner graphic is made to look identical to the spinner that is shown on the MacOS/Aqua LAF when a JProgressBar is used with the JProgressBar.style=circular client property.