Prevent scrolling

When displaying as many or more results than the number of lines in the
terminal, when the last result's length was longer than the width of the
terminal, the extra characters would push the first result up into the
input field.

By not printing more characters than would fit the terminal width, this
behavior is avoided.

src/ui.c

@@ -35,7 +35,7 @@ static int print_choices(struct choices *, int);
 static struct choice *selected_choice(struct choices *, int);
 static void filter_choices(struct choices *, char *, int *);
 static void delete_between(char *, size_t, size_t, size_t);
-static void print_string_at(int, int, char *);
+static void print_string_at(int, int, char *, int);
 
 struct choice *
 ui_selected_choice(struct choices *choices, char *initial_query,
@@ -246,17 +246,21 @@ ui_selected_choice(struct choices *choices, char *initial_query,
 static void
 print_line(int y, char *string, int length, int standout)
 {
+	int columns;
+
+	columns = tty_columns();
+
 	if (standout) {
 		tty_enter_standout_mode();
 	}
 
 	if (length > 0) {
-		print_string_at(y, 0, string);
+		print_string_at(y, 0, string, columns);
 	}
 
 	tty_move_cursor_to(y, length);
 
-	for (; length < tty_columns(); ++length) {
+	for (; length < columns; ++length) {
 		tty_putc(' ');
 	}
 
@@ -352,13 +356,13 @@ delete_between(char *string, size_t length, size_t start, size_t end)
 }
 
 static void
-print_string_at(int y, int x, char *string)
+print_string_at(int y, int x, char *string, int max_length)
 {
 	int i;
 
 	tty_move_cursor_to(y, x);
 
-	for (i = 0; string[i] != '\0'; i++) {
+	for (i = 0; string[i] != '\0' && i < max_length; i++) {
 		tty_putc(string[i]);
 	}
 }