public void setFilterFieldEditable(boolean editable) {
		this.isFilterEditable = editable;
		tree.setFilterFieldEnabled(editable);
	}
Sets the enabled state of the filter field.  This method can be used to prevent the user 
from changing the nodes displayed by the tree.  By default, the filter is enabled.

@param editable true if the field should be editable; false to disable the field
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/util/DataTypeChooserDialog.java