:IndentLinesToggle seems to disable and then immediately enable the guides on Vim 8.
let g:indentLine_enabled = 0 seems to workaround the problem though.
let g:indentLine_enabled = 0
Confirming this behavior in vim 7.4. If I do :IndentLinesToggle or :IndentLinesDisable, they will re-enable again as soon as I try to select text to copy (while holding out to not send the clicks to the underlying application) in ITerm.
let g:indentLine_enabled = 0 prior to :IndentLinesToggle seems to fix it.
Fixes #169. Fixed IndentLinesToggle
Fixes #169. Fixed IndentLinesToggle (#181)