Bug 320285 Messages inteneded for developers in the error log
The message "unsupported: isEditorAreaVisible" appears in the error log during the normal run of e4 SDK. (For instance, starting the e4 SDK on an clean workspace produces two of those messages.)
bundles/org.eclipse.e4.ui.workbench.addons.swt/src/org/eclipse/e4/ui/workbench/addons/perspectiveswitcher/PerspectiveSwitcher.java
changeShowText(preference);
			}
		});
		showtextMenuItem.setSelection(PrefUtil.getAPIPreferenceStore().getBoolean(
				IWorkbenchPreferenceConstants.SHOW_TEXT_ON_PERSPECTIVE_BAR));
	}
	private void changeShowText(boolean showText) {
		ToolItem[] items = psTB.getItems();
		for (int i = 0; i < items.length; i++) {
			MPerspective persp = (MPerspective) items[i].getData();
			if (persp != null)
				if (showText) {
					if (persp.getLabel() != null)
						items[i].setText(persp.getLabel());
					items[i].setToolTipText(persp.getTooltip());
				} else {
					Image image = items[i].getImage();
					if (image != null) {
						items[i].setText("");
						items[i].setToolTipText(persp.getLabel());
					}
				}
		}
		
		psTB.pack();
		psTB.getShell().layout(new Control[] { psTB }, SWT.DEFER);
	}
	private void removePerspectiveItem(MPerspective toRemove) {
		ToolItem psItem = getItemFor(toRemove);
		if (psItem != null) {