The author has marked this style as obsolete.
Now taken care of in the original extension.
By default, the Calculator-Bar extension has a long annoying text label next to its statusbar icon. And, its icon when closed is wider than when open, so it causes a flex of the whole rest of the statusbar. This removes the text and makes the icon use the same width in both states.
I have similar issues with the imagepref extension. Would you know whether this code can be used to take the text for a different extension's statusbar button away? Thank you!
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