'return' inside a 'with' block does not call the __exit__() method of the context manager

[SyamGadde]

class MyWidget(flx.Widget): 
    def init(self): 
        with flx.HBox(): 
            return 
app = flx.App(MyWidget)
app.launch()
flx.run()

Output:

[I 10:18:38 flexx.app] New session MyWidget MtRlNnIWtaIjQci7bC52hB7o
[E 10:18:38 flexx.app] JS: Error: RuntimeError: loop._deactivate_component: MyWidget_1 is not HBox_1js - stack trace in browser console (hit F12).
[E 10:18:38 flexx.app] JS: RuntimeError: RuntimeError: It seems that the event loop is processing events while a Component is active. This has a high risk on race conditions. - stack trace in browser console (hit F12).

Changing the return to pass avoids the error.

Looks like the PScript/Javascript conversion surrounds the contents of the 'with' block in a try/catch, which is in turn surrounded by calls to __enter__/__exit__, so exceptions raised within the try/catch will be caught appropriately. However, __exit__ gets called after the 'catch' clause, and if there is a return statement inside the 'try' block, it never gets there. If the final error checking were in a 'finally' clause, it should work, but haven't tested.

[almarklein]

Nice catch, thanks! We should fix this ...