Bug 187796 [KeyBindings] IBindingService cannot return best active bindings for a ParameterizedCommand
IBindingService only supports getBestActiveBindingFor(final String commandId) ... there must be an equivalent method for ParameterizedCommands PW
bundles/org.eclipse.jface/src/org/eclipse/jface/bindings/BindingManager.java
while (bindingItr.hasNext()) {
			final Binding current = (Binding) bindingItr.next();
			/*
			 * SCHEME: Test whether the current is in a child scheme. Bindings
			 * defined in a child scheme will always take priority over bindings
			 * defined in a parent scheme.
			 */
			final String currentSchemeId = current.getSchemeId();
			final String bestSchemeId = bestMatch.getSchemeId();
			final int compareTo = compareSchemes(bestSchemeId, currentSchemeId);
			if (compareTo > 0) {
				bestMatch = current;
				conflict = false;
			}
			if (compareTo != 0) {
				continue;
			}
			/*
			 * CONTEXTS: Check for context superiority. Bindings defined in a
			 * child context will take priority over bindings defined in a
			 * parent context -- assuming that the schemes lead to a conflict.
			 */
			final String currentContext = current.getContextId();
			final String bestContext = bestMatch.getContextId();
			if (!currentContext.equals(bestContext)) {
				boolean goToNextBinding = false;
				
				String contextPointer = currentContext;
				while (contextPointer != null) {
					if (contextPointer.equals(bestContext)) {