Bug 215985 [Markers] Description column not sorting text
Currently the description column in the problems view is sorting by severity but not comparing Strings of equal severity.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/MarkerEntry.java
return category;
	}
	/**
	 * Set the marker for the receiver.
	 * 
	 * @param marker
	 *            The marker to set.
	 */
	public void setMarker(IMarker marker) {
		this.marker = marker;
		attributeCache.clear();
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.runtime.IAdaptable#getAdapter(java.lang.Class)
	 */
	public Object getAdapter(Class adapter) {
		if (adapter.equals(IMarker.class))
			return marker;
		return null;
	}
	/**
	 * Clear the collations keys collection
	 */
	static void clearCollatorKeys() {
		collationKeys.clear();
	}
}