This ensures compliance with the following WCAG criterion:
"H71: Providing a description for groups of form controls using fieldset
and legend elements".
During request lifecycle ensure that column, filter and condition
persistents are only loaded a single time to prevent additional
database reads.
Provide invalidation method, used by the report helpers, to ensure
that the persistents are re-loaded appropriately.
Co-authored-by: Marina Glancy <marina@moodle.com>
We should gracefully handle invalid element models that refer to
columns, filters, conditions that are no longer defined within the
report/entity they are linked to.
Report conditions allow report creators to limit which data
is displayed when the report is viewed. Users viewing the
report cannot override these condition values.
Paul Holden