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If I use menu Edit > Un/Comment Selection (Windows: Alt+/) the operation can be reversed with the Undo command. This is faster anyway and prevents broken syntax and syntax highlighting that occurs when you remove half a comment marker. (I post this as an answer because I hope it is pragmatically just that.)
In an attempt to reproduce this issue, I began with $Version (* "10.1.0 for Microsoft Windows (64-bit) (March 24, 2015)" *) I then typed x(*y*) and deleted by hand the left asterisk, right asterisk, left parenthesis, and right parenthesis in turn. xy Next I began Edit>Undo until I reached x (y*) At that point, Undo was not grayed out, so the ...
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