Change the way the grid is stored, previously it was:

- a two-dimensional array of cells;
- a two-dimensional array of utf8 data;
- an array of line lengths.

Now it is a single array of a new struct grid_line each of which represents a
line and containts the length and an array of cells and an array of utf8 data.

This will make it easier to add additional per-line members, such as flags.

cmd-list-windows.c

@@ -48,6 +48,7 @@ cmd_list_windows_exec(struct cmd *self, struct cmd_ctx *ctx)
 	struct window		*w;
 	struct window_pane	*wp;
 	struct grid		*gd;
+	struct grid_line	*gl;
 	u_int			 i;
 	unsigned long long	 size;
 	const char		*name;
@@ -65,11 +66,11 @@ cmd_list_windows_exec(struct cmd *self, struct cmd_ctx *ctx)
 
 			size = 0;
 			for (i = 0; i < gd->hsize; i++) {
-				size += gd->size[i] * sizeof **gd->data;
-				size += gd->usize[i] * sizeof **gd->udata;
+				gl = &gd->linedata[i];
+				size += gl->cellsize * sizeof *gl->celldata;
+				size += gl->utf8size * sizeof *gl->utf8data;
 			}
-			size += gd->hsize * (sizeof *gd->data);
-			size += gd->hsize * (sizeof *gd->size);
+			size += gd->hsize * sizeof *gd->linedata;
 
 			if (wp->fd != -1)
 				name = ttyname(wp->fd);