@Override
	protected boolean canClose() {
		provider.cancelCallback(false);
		return false;
	}
Creates the provider that will be displayed in the merge tool. This shows the merge
progress to the user and lets the user resolve conflicts.
Any class that extends this plugin must provide its own MergeManagerProvider here that will 
be shown to the user for the merge.
@return the merge provider associated with this plugin.
Ghidra/Features/Base/src/main/java/ghidra/app/merge/MergeManagerPlugin.java