@Override
		public RegisterValue getRegisterValue(Register register) {
			if (register.getBaseRegister() == contextIn.getRegister()) {
				return contextIn.getRegisterValue(register);
			}
			return null;
		}
Represents a textual suggestion to complete or partially complete an assembly instruction
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/assembler/AssemblyDualTextField.java