The "Switch question bank" modal was attempting to load every question
bank in the system the user has access to. For a highly privileged user,
this could mean loading the coursemodinfo cache for every course in the
system, resulting in memory exhaustion.
This change updates the API for getting shared question banks so it can
be searched by name and limited to a number of results. There is a new
external service that uses this functionality, and a Javascript data
provider for calling the service. The autocomplete in the "Switch
question bank" modal will now use this data provider for the "Other
question bank" autocomplete, rather than loading all banks up front.
Mark Johnson
a8342dd5f5