[Cherry-pick] DYN-10167: Crash fix. Prevent close on Alt+F4 and hide instead.

[github-actions]

Cherry-pick of #16998 to RC4.1.0_master

Purpose

Several crash reports indicate that Dynamo may crash when trying to Show the node autocomplete window. This happened because we did not consider that the user could close the autocomplete window by focusing it and pressing Alt+F4. since there is no UI to really close the window (we hide it for later reuse instead).

Reproduction steps of the crash fixed by this ticket:

• Create a node
• Click the autocomplete sparkle
• By focusing the autocomplete popup (say, by clicking on it) and pressing Alt+F4, we forcefully close the window, and leave dangling transient nodes.
• We then try to open the autocomplete window from the port again. This will result in a crash.

This PR fixes both bugs.

Declarations

Check these if you believe they are true

• Is documented according to the standards
• The level of testing this PR includes is appropriate
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.

Release Notes

Fix crash when closing node autocomplete window with Alt+F4.

Reviewers

@johnpierson
@BogdanZavu

FYIs

(FILL ME IN, Optional) Names of anyone else you wish to be notified of

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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