RFR: 8305352: updateIconImages may lead to deadlock after JDK-8276849

[Sergey Bylokhov]

On Fri, 31 Mar 2023 09:11:20 GMT, Dmitry Cherepanov <dcherepanov at openjdk.org> wrote:

> Please review this PR which suggests to skip updateIconImages() for not yet visible windows. The displayChanged notification can be sent to a window that is in the process of initiailization and calling updateIconImages() may lead to the deadlock.
> 
> Testing: the deadlock no longer happens with this patch. The reg test for JDK-8276849 works (window icon is updated after changing DPI settings).

Marked as reviewed by serb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/13263#pullrequestreview-1396447904