Create a new `objects` instead of appending a value when `check_on_set` is False

[maximlt]

This is useful for Panel when an AutocompleteInput widget is created from a Selector Parameter, with restrict (widget) and check_on_set (Parameter) set to False. Before this change, a new value manually added to the list of completions/options by a user would just be appended to objects, and as such not reflected in the widget options. With this change objects and options are in sync.

[codecov-commenter]

Codecov Report

Merging #596 (69dc92b) into master (7d702ad) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #596   +/-   ##
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  Coverage   81.95%   81.95%           
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  Files           4        4           
  Lines        3020     3020           
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  Hits         2475     2475           
  Misses        545      545           

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[jbednar]

Hmm. Is there a different way that we can get Panel to realize that the object list has changed? Here it seems like the user may have their own reference to the list of objects and expect to be able to modify that list as needed to change the available options, especially outside the context of Panel.

[maximlt]

Do you mean something like that?

[philippjfr]

This should no longer be needed once https://github.com/holoviz/param/pull/598 is merged because that triggers events even when modifying .objects inplace.

[philippjfr]

I'll close because even if we decide to remove the trigger from #598 we should use .param.trigger instead of replacing the list.