[JENKINS-71753] FIXED: clicking choices doesn't work

[ikedam]

https://issues.jenkins.io/browse/JENKINS-71753

Before this fix:

After this fix:

Context:

• Focusing the textbox should open choices. And losing focus from the textbox should close choices.
• Though clicking a choice should update the textbox, it also results losing focus from the textbox.
• HTML fires events in following order: blur for the textbox, and then click for the choice.
• Closing choices in blur event prevents click for the choice from fired.
• So this plugin calls setTimeout() in blur event and performs delayed choices-closing.
• Though this delay worked correct with 100ms before, it now no longer work as expected (just as attached animations).
• This change makes the delay longer. After some tests, it requires 500ms delay.

This is just a workaround, and depends on the behaviors of browsers. There's no fundamental solution for this issue.

Testing done

• No test code for this change. Unfortunately, I couldn't reproduce the issue with test codes.
• I tested the behaviors manually:
  • Firefox 116.0.2 (64 bits) / Windows 11 Home 22H2 (22621.1992)
  • Chrome 115.0.5790.171 (64 bits) / Windows 11 Home 22H2 (22621.1992)

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