Slightly odd behaviour with the filter dialogue

[Peter Mayes]

This refers to tellico-3.5.1 under Fedora38 Linux

I have recently been in OCD heaven sorting and re-cataloging my 
collection of around 1,500 classical CDs, and have noticed some strange 
behaviour.

Since my CDs are ripped to a storage device and played on a network 
music player, they are stored in boxes in a cupboard. I added a new 
field "box" to the collection, so I would be able to find a physical CD 
if needed. It is defined to be of type "Number".

I bring up the filter dialogue and select "Box" and "equals" - I wanted 
to find any entries that haven't been assigned a box number. So I leave 
the value field empty. Problem is that the "OK" and "Apply" buttons are 
not active.

However, I found by trial and error that if I change "Box" to something 
else and back again, the buttons become active. Similarly if I change 
"equals" to another condition and back again, the buttons become active. 
The query then works as expected - I get a list of all CDs not assigned 
a box number.

Not a big deal, and an easy workaround, but just not quite right somehow.

-- 
Best wishes -- Peter
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