Symmetry betwee PyWidget and Widget

[ceprio]

Hi almarklein, I would like to push a change to have more symmetry between PyWidget and Widget:
I can do:

    with ui.Widget(style=overlay_style+"width:0%;") as self.waiting_overlay:
        (...)

But could not do:

    with ui.PyWidget(style=overlay_style+"width:0%;") as self.waiting_overlay:
        (...)

Which I found anoying as I'm using server side processing quite a lot and need to switch Widget from one side to the other seamlessly.

I changed the bokehdemo.py and inserted a PyWidget within to show the style in action.

I have a lot of other things relying on this change so I hope it goes forward one way or another. I hope to submit them at a later point when they get more reliable.

P.S. there is also an optimisation for flask serving within the code (in _flaskserver.py).

Thank you for your time.

[almarklein]

Wow, thanks for this! You're brave to wander in the most complex parts of Flexx ;)

I took a good look and verified that (as far as I can see) popping these values have no consequences elsewhere. I have just a few comments. These are more nitpicky than I'd normally do, but since this code is complex it's worth being extra careful about comments.

[ceprio]

Hi almarklein, the last commit integrates the requested changes on the comments.

Flexx is complex but that is what you get when trying to separate GUI from code. Is there a better way? I do think your solution is elegant and brings portability for the created widgets. That is the main driving force behind Flexx.

Thank you,

[almarklein]

I meant that these low-level component classes are among the most complex code, but this solution is done very well :)

Anyway, thanks!