Twisties appear only after the view has loaded for the view

@sandy081 @isidorn seeing something similar also in the explorer, check how the twistie only appears later: https://user-images.githubusercontent.com/900690/106712642-88201c80-65f9-11eb-879c-49cec53961e6.mov I am feel this was not the case before. _Originally posted by @bpasero in https://github.com/microsoft/vscode/issues/115585#issuecomment-772297308_