Commit "disable fade-in transition when flipping gallery" causes initial empty border/placeholder when flipping gallery

I’m referring to commit https://github.com/tophf/mpiv/commit/1be7fd570f1621c0aa150b224c5dba535c473aa8 The previous commit is: https://github.com/tophf/mpiv/commit/d27df29bdf684c50a7033718abc6a7f3714a14a6

The above commit causes initial empty border/placeholder when flipping gallery.

Test gallery URL: http://www.twilightsite.com/fantasy/Old/Royo/Royo.html Test rule:

{"d": "twilightsite.com",
 "e": "td > a:first-child",
 "s": "gallery",
 "g": {
  "image": "td > a:first-child",
  "index": "return node.href"
 }
}

Screenshot comparison between the two commits (tested having cache disabled):

Before:

After:

Thank you

[tophf]

If you enabled the option in Firefox, it fully reverses the change so whatever happens is unrelated and must be a bug in Firefox.

[tophf]

Indeed, it’s that old Firefox bug again.