Issues with namespace qualified function completion (variant list)

[rhdunn]

1. Type fn into an XQuery document. This lists functions in the fn namespace (and other functions containing fn). This is the expected behaviour. For example:

fn:abs
fn:adjust-date-to-timezone
fn:adjust-dateTime-to-timezone
...

2. Press the : key (so the current context is fn:). This causes the completion list box to disappear. It should list items in namespaces ending with fn (including, e.g. myfn:test, as well as fn:abs, etc.).
3. Type ex (so the current context is fn:ex). This lists:

cts:exists
dbg:expr
math:exp
exactly-one
...
fn:exactly-one
...

This should only list the items matching fn:ex, for example:

fn:exactly-one
fn:exists

4. Press ESC to dismiss the variant list, then type i (so the current context is fn:ex). This lists items matching exi not fn:exi. For example:

cts:exists
exists
fn:exists
xdmp:exists
...