In TextMate ver. 1.5.10 Alt-Command - / does not switch the state of comments (adds, removes) It strictly adds. (at least in my experience)
To answer the question more precisely, if you select the text block that you want to add or remove a comment, pressing the + / command will switch. (add, delete)
Note : this also prints your text. Does anyone know how to eliminate this behavior when using these specific keys? ( Team + / )
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