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Before this commit, when `inccomand` was set to `nosplit`, multi-line substitutions collapsed the command-line. This happened because when ex_getln.c:cursorcmd() computed a msg_row, it was given a cmdline_row one line too high. This happened because message.c:msg_puts_display() was supposed to decrement cmdline_row but didn't, because of the `msg_no_more && lines_left == 0` check placed just before the decrementation part in msg_puts_display's while loop. Every time msg_puts_display writes a line, it decreases `lines_left` (a variable used to know how many lines are left for prompts). Since redrawcommandline() did not reset `lines_left` between calls to msg_puts_display, every time a character was pressed, `lines_left` was decremented. This meant that once the user pressed COLUMNS+ROWS numbers of characters, `lines_left` would reach 0 and prevent msg_row from being decremented. It makes sense to fix setting `lines_left` to `cmdline_row` in `compute_cmdrow` ; after all, computing where the command line row should be placed is equivalent to computing how many `lines_left` of output there are left. Closes #8254.