Merge pull request #1899 from riganti/v5-cleanp-IsPostback-setter #3288

Job	Run time
Build all projects without errors	13m 9s
Build published projects without warnings (Release)	5m 9s
.NET unit tests (ubuntu-latest)	3m 29s
Build published projects without warnings (Debug)	3m 20s
JS unit tests	1m 4s
.NET unit tests (windows-2022)	11m 5s
.NET unit tests (macOS-latest)	6m 46s
UI tests (chrome, ubuntu-latest, Production, Default)	15m 6s
UI tests (chrome, windows-2022, Development, Default)	27m 46s
UI tests (firefox, ubuntu-latest, Development, Default)	19m 39s
UI tests (firefox, ubuntu-latest, Production, Default)	18m 10s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	19m 46s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	16m 10s
	2h 40m 39s

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