[web/data] fix treeview regression (closes #3526466)
Changeset 68cde7431c2c "[js] remove 3.9 bw compat (where apparently
unused)" removed the use of form.callback from loadxhtml, which treeview
relied on. Update to add a callback on the loadxhtml return value
instead.
[MESSAGES CONTROL]
disable-msg = C0301
[VARIABLES]
# Enable / disable this checker
enable-variables = yes
additional-builtins = _, display_name
[BASIC]
required-attributes=
attr-rgx = (w|[a-z_][a-z0-9_]{2,30})
variable-rgx = (w|[a-z_][a-z0-9_]{2,30})$
argument-rgx = (w|[a-z_][a-z0-9_]{2,30})$
[TYPECHECK]
generated-members=debug,info,notice,warning,error,critical,exception