private ActionTrigger getActionTrigger(SharedDockingActionPlaceholder placeholder) {
		KeyStroke defaultKs = placeholder.getKeyBinding();
		if (defaultKs != null) {
			return new ActionTrigger(defaultKs);
		}
		return null;
	}
Allows clients to register an action by using a placeholder.  This is useful when
an API wishes to have a central object (like a plugin) register actions for transient
providers, that may not be loaded until needed.

<p>This method may be called multiple times with the same conceptual placeholder--the
placeholder will only be added once.

@param placeholder the placeholder containing information related to the action it represents
Ghidra/Framework/Docking/src/main/java/docking/actions/ToolActions.java