Do not flash loading class in modal refresh

[mvorisek]

introduced in Semantic-Org/Semantic-UI#5578

Is the hack using loading class still needed? It causes a problem in out environment because it flashes the class causing our observers to trigger.

Maybe more changes/LoC removed are needed/wanted.

[prudho]

Remove the loading hack looks ok to me, but deleting the CSS is not a good idea IMHO. Some users might want to make their modals in a loading state, when using ajax for example.

[mvorisek]

I still do not understand the Semantic-Org/Semantic-UI@7450aa3 described in Semantic-Org/Semantic-UI#5578 (comment). Maybe flashing the loading class is needed.

I am closing this PR as I am unsure about this PR, we needed also the CSS removed (https://github.com/atk4/ui/blob/37a5a0b522/js/src/JqueryPlugin/ReloadViewPlugin.js#L53) and we worked around it on atk4 side.

[lubber-de]

Jack was basically right: To be able to calculate/ access dimensions of DOM nodes, they have to be visible (to the browser, off canvas is fine, but display:none is not, as this does not occupy any visible space)
However, i still want #2969 to be implemented and perhaps the whole JS calculation isnt necessary anymore for that purpose, especially after the IE drop. I'll tag this for investigation