[Mockup][Contribution] How to keep Un-collapsed Vertical Tab when opening context menu

[gunir]

Hi Mr. @surapunoyousei !

I'm an enthusiasm Floorp user and I'm regularly testing Floorp and Floorp Daylight.

Currently I found a small bug that Vertical Tab with Collapse enabled doesn't seem to stay when opening context menu, so here is what I did to patch this bug:

    menupopup, panel {
        --panel-shadow-margin: 0px!important;
        --panel-shadow: 0px!important;   
    }

Add this code to userChrome.css for testing.

Disabling panel-shadow seems to fix this issue completely, here is the result:

GIF Result