closeTab: show confirmation dialog when tab has multiple panes

[WolffM]

Summary

Fixes #5301: closeTab: show confirmation dialog when tab has multiple panes

Changes

This PR addresses the issue described above. Changes were developed on the fix/5301-closetab-show-confirmation-dialog-when-tab-has-mul branch.

Related Issue

• Closes closeTab should present a confirmation dialog #5301

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