I have often found it difficult to match a background color or the color of another sprite when editing a costume. If the eyedropper tool could be used beyond the paint editor window (as is standard in other drawing tools), this task would be much easier.
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Ironically, the eyedropper for command blocks works everywhere, when it would often be more useful if it had a drop-down pallete, since trying to "eyedrop" the colour on an individual sprites "feelers" whilst in "programing" mode is next to impossible
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