Bug 30941 Preferences default initialization. Can not do a syncExec
20030204 The initialization of the preference default currently contains a final Display display= Display.getDefault(); display.syncExec(new Runnable() { public void run() { Color c= display.getSystemColor(SWT.COLOR_GRAY); rgbs[0]= c.getRGB(); c= display.getSystemColor(SWT.COLOR_LIST_FOREGROUND); rgbs[1]= c.getRGB(); c= display.getSystemColor(SWT.COLOR_LIST_BACKGROUND); rgbs[2]= c.getRGB(); } }); We should avoid and remove this as this is a candidate for a deadlock.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/JavaEditorPreferencePage.java
fBackgroundColorButton.setEnabled(custom);
				fOverlayStore.setValue(PreferenceConstants.EDITOR_BACKGROUND_DEFAULT_COLOR, !custom);
			}
			public void widgetDefaultSelected(SelectionEvent e) {}
		};
		fBackgroundDefaultRadioButton= new Button(backgroundComposite, SWT.RADIO | SWT.LEFT);
		fBackgroundDefaultRadioButton.setText(PreferencesMessages.getString("JavaEditorPreferencePage.systemDefault")); 
		fBackgroundDefaultRadioButton.addSelectionListener(backgroundSelectionListener);
		fBackgroundCustomRadioButton= new Button(backgroundComposite, SWT.RADIO | SWT.LEFT);
		fBackgroundCustomRadioButton.setText(PreferencesMessages.getString("JavaEditorPreferencePage.custom")); 
		fBackgroundCustomRadioButton.addSelectionListener(backgroundSelectionListener);
		fBackgroundColorEditor= new ColorEditor(backgroundComposite);
		fBackgroundColorButton= fBackgroundColorEditor.getButton();
		Label label= new Label(colorComposite, SWT.LEFT);
		label.setText(PreferencesMessages.getString("JavaEditorPreferencePage.foreground")); 
		label.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		Composite editorComposite= new Composite(colorComposite, SWT.NONE);
		GridLayout layout= new GridLayout();
		layout.numColumns= 2;
		layout.marginHeight= 0;
		layout.marginWidth= 0;
		editorComposite.setLayout(layout);
		GridData gd= new GridData(GridData.FILL_BOTH);
		editorComposite.setLayoutData(gd);		
		fSyntaxColorList= new List(editorComposite, SWT.SINGLE | SWT.V_SCROLL | SWT.BORDER);
		gd= new GridData(GridData.FILL_BOTH);
		gd.heightHint= convertHeightInCharsToPixels(5);
		fSyntaxColorList.setLayoutData(gd);
						
		Composite stylesComposite= new Composite(editorComposite, SWT.NONE);