RFR: 8349004: DatePicker: NPE in show() when initialized in a background thread

[Kevin Rushforth]

On Wed, 12 Feb 2025 19:45:32 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> ## Root Cause
> 
> Focus is being requested in show(), even a background thread.
> 
> ## Solution
> 
> Do not request focus if in a background thread.

Reviewers: @kevinrushforth @arapte

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PR Comment: https://git.openjdk.org/jfx/pull/1708#issuecomment-2655012247