HPCC-11656 Weird behaviour in search box

Search text is now trimmed by the entry field.
Delay Load Widget would fail if called twice in "quick" succession for the same
item.

Fixes HPCC-11656

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #6095 from GordonSmith/HPCC-11656

HPCC-11656 Weird behaviour in search box

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>