This is an attempt to make selecting a custom input more intuitive by letting the user select the prompt line, as suggested by @Stebalien in #933 (comment).
Calling ivy-done (C-m) or ivy-alt-done (C-j) on a selected prompt exits with the current user input and is thus equivalent to calling ivy-immediate-done (C-M-j) when any candidate is selected. Therefore, remembering C-M-j is not necessary anymore. If no candidate matches the current input, the prompt line is selected automatically, as this is the only option left for the user.
To activate this behaviour, set the new variable ivy-use-selectable-prompt to t. Note that selecting the prompt line is not possible if ivy-read is called with predicate :require-match set to t, since a custom input is not allowed in this case. Customize face ivy-prompt-match to adjust the look of the selected prompt if you want it to differ from a selected candidate.
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