ComponentPlaceholder createOrRecyclePlaceholder(ComponentProvider provider) {
		return createOrRecyclePlaceholder(provider, null /*no default*/);
	}
Moves all the actions associated with the old placeholder into the new placeholder.
@param oldPlaceholder the old component placeholder being replaced.
@param newPlaceholder the new component placeholder.
Ghidra/Framework/Docking/src/main/java/docking/PlaceholderManager.java