Thank you for the suggestion.

I switched the deselect-all code to
   LISTBOX SELECT ROW(*;"valsBox";1;lk replace selection)               
   LISTBOX SELECT ROW(*;"valsBox";1;lk remove from selection)
and the selection did clear, however as soon as this add-to-selection code is 
   LISTBOX SELECT ROW(*;"valsBox";0;lk replace selection)
4D immediately crashes.

If all 40k rows get deselected, using either method, and selecting them all 
again is done in a loop, the loop finishes in about two seconds.  
At that point the macOS spinning wheel appears for three minutes. The highlight 
then appears and control is returned to the app.
The fewer the records being highlighted, the shorter the macOS wheel spins.

Keith - CDI

> On Apr 15, 2019, at 7:50 PM, Justin Carr via 4D_Tech <4d_tech@lists.4d.com> 
> wrote:
> On 16 Apr 2019, at 5:04 am, Keith Culotta via 4D_Tech <4d_tech@lists.4d.com> 
> wrote:
>> Hello,
>> I'm looking for a fast way to highlight a selection of rows in an entity 
>> selection listbox.  The way I am aware of works OK unless the listbox gets a 
>> large number of rows.
>> Adding records to the Selected Items name in the Property list does not 
>> highlight the listbox contents.  The equivalent of adding records to the 
>> "UserSet" is not available with entity selection listboxes.
>> Highlighting all with LISTBOX SELECT ROW(*;"listBox";0;lk add to selection) 
>> crashes 4D if the listbox contains enough records.
>> LISTBOX SELECT ROW(*;"listBox";$position;lk add to selection) crashes if put 
>> in a fast FOR loop.  If the loop is executed more slowly there is success.  
>> The slowness comes from looking for entitySelected[i] within the entity 
>> selection and highlighting its position in the listbox.
>> Is there a better way to get there?
> Hey Keith
> Are you clearing the listbox selection first (with LISTBOX SELECT 
> ROW(*;"listBox";0;lk remove from selection)? If so, that is probably the 
> cause of the crashing you are seeing. You can workaround it by highlighting 
> and unhighlighting the first row instead, i.e. 
> LISTBOX SELECT ROW(*;"listBox";1;lk replace selection)
> LISTBOX SELECT ROW(*;"listBox";1;lk remove from selection)
> cheers
> Justin

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