window.c: Handle multiple keyboard foci

Keep a count of number of wl_keyboard focus we have instead of
tracking the more recent wl_keyboard.

clients/terminal.c

@@ -404,7 +404,6 @@ struct terminal {
 	struct utf8_state_machine state_machine;
 	int margin;
 	int fullscreen;
-	int focused;
 	struct color_scheme *color_scheme;
 	struct terminal_color color_table[256];
 	cairo_font_extents_t extents;
@@ -537,7 +536,7 @@ terminal_decode_attr(struct terminal *terminal, int row, int col,
 	if ((attr.a & ATTRMASK_INVERSE) ||
 	    decoded->attr.s ||
 	    ((terminal->mode & MODE_SHOW_CURSOR) &&
-	     terminal->focused && terminal->row == row &&
+	     window_has_focus(terminal->window) && terminal->row == row &&
 	     terminal->column == col)) {
 		foreground = attr.bg;
 		background = attr.fg;
@@ -999,7 +998,8 @@ redraw_handler(struct widget *widget, void *data)
 	attr.key = ~0;
 	glyph_run_flush(&run, attr);
 
-	if ((terminal->mode & MODE_SHOW_CURSOR) && !terminal->focused) {
+	if ((terminal->mode & MODE_SHOW_CURSOR) &&
+	    !window_has_focus(terminal->window)) {
 		d = 0.5;
 
 		cairo_set_line_width(cr, 1);
@@ -2260,7 +2260,6 @@ keyboard_focus_handler(struct window *window,
 {
 	struct terminal *terminal = data;
 
-	terminal->focused = (device != NULL);
 	window_schedule_redraw(terminal->window);
 }
 

clients/window.c

@@ -145,7 +145,8 @@ struct window {
 	int resize_needed;
 	int type;
 	int transparent;
-	struct input *keyboard_device;
+	int focus_count;
+
 	enum window_buffer_type buffer_type;
 
 	cairo_surface_t *cairo_surface;
@@ -769,6 +770,12 @@ window_attach_surface(struct window *window)
 	}
 }
 
+int
+window_has_focus(struct window *window)
+{
+	return window->focus_count > 0;
+}
+
 void
 window_flush(struct window *window)
 {
@@ -1514,7 +1521,7 @@ frame_redraw_handler(struct widget *widget, void *data)
 
 	cr = cairo_create(window->cairo_surface);
 
-	if (window->keyboard_device)
+	if (window->focus_count)
 		flags |= THEME_FRAME_ACTIVE;
 	theme_render_frame(t, cr, widget->allocation.width,
 			   widget->allocation.height, window->title, flags);
@@ -1938,7 +1945,7 @@ input_remove_keyboard_focus(struct input *input)
 	if (!window)
 		return;
 
-	window->keyboard_device = NULL;
+	window->focus_count--;
 	if (window->keyboard_focus_handler)
 		(*window->keyboard_focus_handler)(window, NULL,
 						  window->user_data);
@@ -2031,11 +2038,10 @@ keyboard_handle_enter(void *data, struct wl_keyboard *keyboard,
 	input->keyboard_focus = wl_surface_get_user_data(surface);
 
 	window = input->keyboard_focus;
-	window->keyboard_device = input;
+	window->focus_count++;
 	if (window->keyboard_focus_handler)
 		(*window->keyboard_focus_handler)(window,
-						  window->keyboard_device,
-						  window->user_data);
+						  input, window->user_data);
 }
 
 static void
@@ -2064,7 +2070,7 @@ keyboard_handle_key(void *data, struct wl_keyboard *keyboard,
 
 	input->display->serial = serial;
 	code = key + 8;
-	if (!window || window->keyboard_device != input || !input->xkb.state)
+	if (!window || !input->xkb.state)
 		return;
 
 	num_syms = xkb_key_get_syms(input->xkb.state, code, &syms);

clients/window.h

@@ -205,6 +205,9 @@ window_create_transient(struct display *display, struct window *parent,
 struct window *
 window_create_custom(struct display *display);
 
+int
+window_has_focus(struct window *window);
+
 typedef void (*menu_func_t)(struct window *window, int index, void *data);
 
 void