Documentation stack and lost work

[Alister Pillow]

Hi
When I mis-type something into the "find text" box of the (new v2.5) 
Documentation stack, the "No entries match your filter criteria" alert 
appears.

Hit <return> to close the alert
Hit <backspace> to delete the characters I typed
...
but not quick enough. The dialogue is back, "No entries ...."
...
and then, I notice that the object I've been working on (perhaps a 
multi-field group) has disappeared!
Undo? Nothing left to undo. Curse? Profoundly.

Has anyone else encountered this? Should I drink less coffee?

Regards,
Alister.