skip empty cells before applying a style

Fix empty cells erroneously being styled.

The view_style function is used to apply styles to ranges of text in
a view. It approaches the starting position where the style should be
applied by iterating the columns in the appropriate line using
this while loop:

	while (pos < start && col < width)
		pos += line->cells[col++].len;

The while loop will stop at the last character before the range where
the style should be applied.

This works fine until we encounter "empty" cells between the
last cell containing an actual character and the first cell to be styled.
This can happen if the last character before the range to style is '\t'
which gets expanded with empty cells by vis according to the tabwidth
option.
Those empty cells get erroneously styled as well.

This is fixed by skipping all empty cells encountered before the
range to style.

view.c

@@ -1428,6 +1428,10 @@ void view_style(View *view, enum UiStyle style_id, size_t start, size_t end) {
 	while (pos < start && col < width)
 		pos += line->cells[col++].len;
 
+	/* skip empty columns */
+	while (!line->cells[col].len && col < width)
+		col++;
+
 	do {
 		while (pos <= end && col < width) {
 			pos += line->cells[col].len;