PicMo 5.7.3

[joeattardi]

• [picmo] Fixed buggy scroll adjustment code that was sometimes causing issues when showing/hiding the picker. (#246)
• [picmo] Added the picmo__ prefix to all class names to reduce style conflicts. (#253)
• [picmo] Replaced all uses of Element.replaceChildren with a safer implementation that has better browser compatibility. (#256)

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This discussion was created from the release PicMo 5.7.3.