Add -l flag to command-prompt to disable splitting into multiple prompts,

GitHub issue 4483.

tmux.1

@@ -6670,7 +6670,7 @@ See
 for possible values for
 .Ar prompt-type .
 .It Xo Ic command-prompt
-.Op Fl 1bFikN
+.Op Fl 1bFiklN
 .Op Fl I Ar inputs
 .Op Fl p Ar prompts
 .Op Fl t Ar target-client
@@ -6690,8 +6690,10 @@ With
 .Ar template
 is expanded as a format.
 .Pp
-If present,
+If
 .Fl I
+is present,
+.Ar inputs
 is a comma-separated list of the initial text for each prompt.
 If
 .Fl p
@@ -6703,6 +6705,12 @@ a single prompt is displayed, constructed from
 if it is present, or
 .Ql \&:
 if not.
+.Fl l
+disables splitting of
+.Ar inputs
+and
+.Ar prompts
+at commas and treats them literally.
 .Pp
 Before the command is executed, the first occurrence of the string
 .Ql %%