There seems to a safeguard in the form of an "Are you sure?" message to keep you from accidentally dragging a file from one folder to another at the Solution Explorer in Visual Studio 2019 nowadays.

This is overdue. It does not seem to work cross-project however. I wish Visual Studio was smart enough to just stop Kestrel whenever I start typing in a class whenever it is running in lieu of telling me that I can't change the code while the debugger is underway. I hate that too.