Bug 25458 [Font] DBCS support: new SWT API
Last Friday we have included a new API in Font: public Font(Device device, FontData[] fds) { In order to have a more appropriate behavior on DBCS platforms Eclipse/UI should start using this API. Anyway, the best police still is never change the default font in the widget if you don't need to. (this new API is going to make difference in Eclipse/Motif only)
bundles/org.eclipse.jface/src/org/eclipse/jface/resource/FontRegistry.java
FontData validData = bestData(fonts,display);
	if(validData == null){
		 
		return null;
	}
	else {
		
		FontData[] newEntry = new FontData[1];
		newEntry[0] = validData;
		
		put(symbolicName,newEntry,false);
		return new Font(display, validData);
	}
}
/**
 * Returns the default font.  Creates it if necessary.
 */
Font defaultFont() {
	Display current = Display.getCurrent();
	if(current == null){
		Shell shell = new Shell();
		Font font = shell.getFont();
		shell.dispose();
		return font;
	}
	else
		return current.getSystemFont();
}
/**
 * Returns the default font data.  Creates it if necessary.