MMM-OnSpotify module causes MagicMirror to draws things multiple times

[TheEpicTen]

I'm adding 2 images of the clock and Newsfeed module to show what I mean.

https://imgur.com/a/2B9Sj6R

Not sure how to fix this or what's causing it, but I have the MMM-OnSpotify module, and it temporarily fixes every time the currently playing song changes.

[KristjanESPERANTO]

Does the problem also occur if you deactivate all modules except for the clock?

[TheEpicTen]

I'll have a look in about an hour.

[TheEpicTen]

Well my mirror no longer starts. I have a solution, but not enough time to do it today. I'll work on it tomorrow

[TheEpicTen]

So the only time this issue occurs is when something is playing and shown on the onspotify module. I'll put this issue on that repo.

[Fabrizz]

I can reproduce this as it only happens on the machine that I use to develop. Im sure that its related on how chromium readers things (In this case I thing its related to css filters and opacity interactions).

I cannot find issues similar to this as some times MM2 appears drawn over other tab in my machine and that REALLY makes no sense.

Im sure that there is a way of using flags to change how rendering works in electron and or other browsers. Changing the viewport size fixes this as its just a rendering artifact.

EDIT: will try to reproduce, and maybe open a bug on the chromium bug tracker(?

[Fabrizz]

Other pages

REALLY strange

On the same page

Happens instantly with my setup

[TheEpicTen]

Oh, interesting. I only get the doubles when mirror is the active window, they don’t appear otherwise. Can be fixed temporarily by reloading mm(Ctrl+r), but comes back very quickly. I’ll have a look later to make sure, but how do I change viewport size?

[sdetweil]

I don't understand viewport? MM IS the viewport.. full screen intended..

IF your module wants a smaller 'viewport' then it has to use html idoms to create another , like iframe
https://developer.mozilla.org/en-US/docs/Web/CSS/Viewport_concepts
and use css to customize its size

else it uses size to control the drawing area height, width ....

IF the module resurfaced from off screen/hidden, its resume() method would be called..

[Fabrizz]

I don't understand viewport? MM IS the viewport.. full screen intended..

IF your module wants a smaller 'viewport' then it has to use html idoms to create another , like iframe
https://developer.mozilla.org/en-US/docs/Web/CSS/Viewport_concepts
and use css to customize its size

else it uses size to control the drawing area height, width ....

IF the module resurfaced from off screen/hidden, its resume() method would be called..

Nono, I'm just saying that a viewport change in the page (or a color change on the elements that have a filter) triggers a repainting, thus the bug disapears. (Just a visual thing)

I made the corresponding bug report on the chromium bug tracker.

The best way (hacky way) to make this disapear would be to change the colors a bit over time or not use that background effect.

I don't know if maybe instead of using css for opacity using the alpha channel in the color would be different, as that is not applied after

[sdetweil]

ok, we don't know about css when we do updateDom().. we check that the redendered content is the same or not.
so if style changed under the covers (animated background) that would be a browser shadow dom change I think. and outside our knowledge