Issue #3461277 by pdureau, Christian.wiedemann: Sources don't support required - #title missing

modules/ui_patterns_legacy/src/ComponentConverter.php

...ns_legacy/src/Drush/Commands/UiPatternsLegacyCommands.php

modules/ui_patterns_legacy/ui_patterns_legacy.services.yml

src/ComponentPluginManager.php

src/Element/ComponentPropForm.php

src/Plugin/UiPatterns/Source/AttributesWidget.php

src/Plugin/UiPatterns/Source/CheckboxWidget.php

src/Plugin/UiPatterns/Source/CheckboxesWidget.php

src/Plugin/UiPatterns/Source/EntityLinksSource.php

src/Plugin/UiPatterns/Source/ListTextareaWidget.php

src/Plugin/UiPatterns/Source/MenuSource.php

src/Plugin/UiPatterns/Source/NumberWidget.php

src/Plugin/UiPatterns/Source/PathSource.php

src/Plugin/UiPatterns/Source/SelectWidget.php

src/Plugin/UiPatterns/Source/TextfieldWidget.php

src/Plugin/UiPatterns/Source/TokenSource.php

src/Plugin/UiPatterns/Source/UrlWidget.php

src/Plugin/UiPatterns/Source/WysiwygWidget.php

src/PropTypePluginBase.php

src/SourcePluginBase.php