Keyword search in hierarchies with multiple roots does not work #363
Description
The search in restricted hierarchies with their root set dynamically, such as the one used for the postcoordination axis values was improved significantly by the fix for issue #279 . However, when the displayed hierarchy has multiple roots, as it is sometimes the case for logical definition axis values, the search does not seem to work. We encountered this while trying to edit the value for the "Specific Anatomy" axis on the logical definition of the Malignant neoplasm metastasis in sinus. Observe in the screenshot below that searching for the "Accessory sinuses" does not return a suggested value, although the value is in the class hierarchy and is a valid value for this axis.
The most likely reason for the search failing is that the selected logical definition Superclass "Malignant neoplasm metastasis in thoracic or respiratory organs" specifies 4 possible value sets ("Respiratory System", "Heart", "Diaphragm", "Mediastinum") for the Specific Anatomy axis, and although the hierarchy can display all four class hierarchies, the search operation gets confused.
