Can work out active pane itself.

screen-redraw.c

@@ -935,20 +935,6 @@ screen_redraw_draw_get_style_pane(struct redraw_scene *scene,
 	return (NULL);
 }
 
-/* Should this span use the active style? */
-static int
-screen_redraw_draw_border_active(struct redraw_scene *scene,
-    struct redraw_span *span)
-{
-	struct window_pane	*active = server_client_get_pane(scene->c);
-
-	if (span->data.type != REDRAW_SPAN_BORDER || active == NULL)
-		return (0);
-	if (span->data.b.style_wp != NULL)
-		return (span->data.b.style_wp == active);
-	return (screen_redraw_span_has_pane(span, active));
-}
-
 /* Draw arrow indicator if this border span is an arrow cell. */
 static void
 screen_redraw_draw_border_arrow(struct redraw_scene *scene,
@@ -991,7 +977,7 @@ screen_redraw_draw_border_span(struct redraw_scene *scene,
 	struct grid_cell	 gc;
 	enum pane_lines		 pane_lines;
 	u_int			 i, cell_type;
-	int			 isolates = 0, active;
+	int			 isolates = 0;
 
 	if (span->data.type != REDRAW_SPAN_BORDER)
 		cell_type = CELL_OUTSIDE;
@@ -1002,11 +988,10 @@ screen_redraw_draw_border_span(struct redraw_scene *scene,
 
 	if (wp == NULL) {
 		pane_lines = options_get_number(oo, "pane-border-lines");
-		window_get_border_cell(w, NULL, pane_lines, cell_type, &gc);
 		screen_redraw_draw_get_default_style(scene, &gc);
+		window_get_border_cell(w, NULL, pane_lines, cell_type, &gc);
 	} else {
-		active = screen_redraw_draw_border_active(scene, span);
+		window_pane_get_border_style(wp, c, &gc);
-		window_pane_get_border_style(wp, c, active, &gc);
 		window_pane_get_border_cell(wp, cell_type, &gc);
 	}
 
@@ -1353,11 +1338,16 @@ screen_redraw_draw(struct client *c, struct window_pane *wp, int flags)
 int
 screen_redraw_get_span_cell_type(struct redraw_span *span, u_int x)
 {
+	struct window_pane	*wp = span->data.st.wp;
 	u_int			 start, end;
 
+	if (span->data.type != REDRAW_SPAN_STATUS)
+		return (CELL_LEFTRIGHT);
 	for (; span != NULL; span = TAILQ_NEXT(span, entry)) {
 		if (span->data.type != REDRAW_SPAN_STATUS)
 			continue;
+		if (span->data.st.wp != wp)
+			continue;
 
 		start = span->data.st.offset;
 		end = start + span->width;

tmux.h

@@ -3540,7 +3540,7 @@ void		 window_get_border_cell(struct window *, struct window_pane *,
 void		 window_pane_get_border_cell(struct window_pane *, int,
 		     struct grid_cell *);
 void		 window_pane_get_border_style(struct window_pane *,
-		     struct client *, int, struct grid_cell *);
+		     struct client *, struct grid_cell *);
 void		 window_make_pane_status(struct window_pane *, struct client *,
 		     u_int, struct redraw_span *);
 

window-border.c

@@ -18,6 +18,8 @@
 
 #include <sys/types.h>
 
+#include <string.h>
+
 #include "tmux.h"
 
 /* Get border cell. */
@@ -82,7 +84,7 @@ window_pane_get_border_cell(struct window_pane *wp, int cell_type,
 /* Get pane border style. */
 void
 window_pane_get_border_style(struct window_pane *wp, struct client *c,
-    int active, struct grid_cell *gc)
+    struct grid_cell *gc)
 {
 	struct session		*s = c->session;
 	struct format_tree	*ft;
@@ -90,7 +92,7 @@ window_pane_get_border_style(struct window_pane *wp, struct client *c,
 	struct grid_cell	*saved;
 	int			*flag;
 
-	if (active) {
+	if (wp == server_client_get_pane(c)) {
 		flag = &wp->active_border_gc_set;
 		saved = &wp->active_border_gc;
 		option = "pane-active-border-style";
@@ -115,7 +117,7 @@ window_make_pane_status(struct window_pane *wp, struct client *c, u_int width,
     struct redraw_span *span)
 {
 	struct grid_cell	 gc;
-	const char		*fmt, *border_option;
+	const char		*fmt;
 	struct format_tree	*ft;
 	struct style_line_entry	*sle = &wp->border_status_line;
 	struct screen_write_ctx	 ctx;
@@ -130,20 +132,17 @@ window_make_pane_status(struct window_pane *wp, struct client *c, u_int width,
 	ft = format_create(c, NULL, FORMAT_PANE|wp->id, FORMAT_STATUS);
 	format_defaults(ft, c, c->session, c->session->curw, wp);
 
-	if (wp == server_client_get_pane(c))
-		border_option = "pane-active-border-style";
-	else
-		border_option = "pane-border-style";
-	style_apply(&gc, wp->options, border_option, ft);
 
 	fmt = options_get_string(wp->options, "pane-border-format");
 	expanded = format_expand_time(ft, fmt);
 
+	screen_free(&wp->status_screen);
 	screen_init(&wp->status_screen, width, 1, 0);
 	wp->status_screen.mode = 0;
 
 	screen_write_start(&ctx, &wp->status_screen);
 
+	window_pane_get_border_style(wp, c, &gc);
 	for (i = 0; i < width; i++) {
 		cell_type = screen_redraw_get_span_cell_type(span, i);
 		window_pane_get_border_cell(wp, cell_type, &gc);