tabbing: don't refresh the edit window when nothing was printed on it

This is a remnant from 2001, when things were different.  Now, there
is no need to refresh the edit window when tabbing produced no list.
When it did produce a list, it is cleared off later.

src/files.c

@@ -2770,14 +2770,14 @@ char **cwd_tab_completion(const char *buf, bool allow_files, size_t
 /* Do tab completion.  place refers to how much the statusbar cursor
  * position should be advanced.  refresh_func is the function we will
  * call to refresh the edit window. */
-char *input_tab(char *buf, bool allow_files, size_t *place, bool
-	*lastwastab, void (*refresh_func)(void), bool *listed)
+char *input_tab(char *buf, bool allow_files, size_t *place,
+	bool *lastwastab, bool *listed)
 {
     size_t num_matches = 0, buf_len;
     char **matches = NULL;
 
     assert(buf != NULL && place != NULL && *place <= strlen(buf) &&
-		lastwastab != NULL && refresh_func != NULL && listed != NULL);
+		lastwastab != NULL && listed != NULL);
 
     *listed = FALSE;
 
@@ -2923,11 +2923,6 @@ char *input_tab(char *buf, bool allow_files, size_t *place, bool
 
     free_chararray(matches, num_matches);
 
-    /* Only refresh the edit window if we don't have a list of filename
-     * matches on it. */
-    if (!*listed)
-	refresh_func();
-
     return buf;
 }
 #endif /* !DISABLE_TABCOMP */

src/prompt.c

@@ -619,7 +619,7 @@ functionptrtype get_prompt_string(int *actual, bool allow_tabs,
 #endif
 	    if (allow_tabs)
 		answer = input_tab(answer, allow_files, &statusbar_x,
-				   &tabbed, refresh_func, listed);
+				   &tabbed, listed);
 
 	    update_the_statusbar();
 	} else
@@ -786,9 +786,8 @@ int do_prompt(bool allow_tabs,
 #endif
 
 #ifndef DISABLE_TABCOMP
-    /* If we've done tab completion, there might be a list of filename
-     * matches on the edit window at this point.  Make sure that they're
-     * cleared off. */
+    /* If we've done tab completion, and a list of filename matches
+     * was printed in the edit window, clear them off. */
     if (listed)
 	refresh_func();
 #endif

src/proto.h

@@ -339,8 +339,8 @@ char **username_tab_completion(const char *buf, size_t *num_matches,
 	size_t buf_len);
 char **cwd_tab_completion(const char *buf, bool allow_files, size_t
 	*num_matches, size_t buf_len);
-char *input_tab(char *buf, bool allow_files, size_t *place, bool
-	*lastwastab, void (*refresh_func)(void), bool *listed);
+char *input_tab(char *buf, bool allow_files, size_t *place,
+	bool *lastwastab, bool *listed);
 #endif
 const char *tail(const char *foo);
 #ifndef DISABLE_HISTORIES