some images exhibit a moiré glitch because Galleria enforces image-rendering: optimizeQuality

[mateuszviste]

When Galleria displays an image, it apparently enforces an 'image-rendering: optimizeQuality' CSS property. I can only assume that this property is included for compatibility with some browsers, but with the browser I use (Firefox 72.0.2) the effect is really ugly:

By disabling this CSS effect in Firefox web developer tools I was able to see the image being properly rendered:

Unfortunately this behavior does not seem to be configurable.

Tested with Firefox 72.0.2 and latest Galleria 1.6.1.