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There is a cool new feature in Emacs 25: visual support for rectangular selection. However, I would like to set its width to one pixel when it's “logical” width is zero columns of text. By default it's a bit too bold. Is it possible?

Also, it would be cool if it didn't “shift” text on the right side of the selection when its width is zero.

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It seems as of now there is no (non-hacking) way to achieve what you want. Looking at source code an overlay with a space is added when the rectangle is of zero width.

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