vi: fix backspace over tab in commands

Colon and search commands are entered on the status line.  Since
the cursor position wasn't being tracked backspacing over a tab
resulted in a mismatch between the actual and apparent content
of the command.

function                                             old     new   delta
get_input_line                                       178     180      +2
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 2/0)                 Total: 2 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/editors/vi.c b/editors/vi.c
index 4257c0fdc..6fa0a4e18 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -1217,10 +1217,11 @@ static char *get_input_line(const char *prompt)
                         break;          // this is end of input
                 if (isbackspace(c)) {
                         // user wants to erase prev char
-                        write1("\b \b"); // erase char on screen
                         buf[--i] = '\0';
+                        go_bottom_and_clear_to_eol();
                         if (i <= 0) // user backs up before b-o-l, exit
                                 break;
+                        write1(buf);
                 } else if (c > 0 && c < 256) { // exclude Unicode
                         // (TODO: need to handle Unicode)
                         buf[i] = c;