Launcher: save default settings before opening file for users (#4042) #20479

Job	Run time
Test hosting with 3.12 on ubuntu-latest	3m 11s
Test Python 3.8 ubuntu-latest	5m 8s
Test Python 3.9 ubuntu-latest	4m 14s
Test Python 3.10 ubuntu-latest	4m 10s
Test Python 3.11 ubuntu-latest	4m 24s
Test Python 3.12 ubuntu-latest	5m 56s
Test Python 3.8 windows-latest	5m 54s
Test Python 3.12 windows-latest	7m 2s
Test Python 3.12 macos-latest	4m 2s
	44m 1s

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