RFR: 8322754: click JComboBox when dialog about to close causes IllegalComponentStateException

[Sergey Bylokhov]

On Thu, 4 Jan 2024 07:23:59 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> Clicking to open a JComboBox popup during AWT event processing at the end of which the dialog will be closed causes an IllegalComponentStateException.
> Fix is made to check if combobox is showing before showing the popup to prevent the exception.

Marked as reviewed by serb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/17262#pullrequestreview-1806696232