[PATCH 4/7] Store RootWindow in global_screen structure

Every screen stores a copy of xrandr RootWindow even if they all share
the same RootWindow.

This patch stores the RootWindow in a global location for all
screens. Further work is required to remove RootWindow from per screen
structure.
---
 src/data.h   | 1 +
 src/screen.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/src/data.h b/src/data.h
index 08f1667..3975955 100644
--- a/src/data.h
+++ b/src/data.h
@@ -152,6 +152,7 @@ struct rp_group
 
 struct rp_global_screen
 {
+  Window root;
   unsigned long fg_color, bg_color, fw_color, bw_color; /* The pixel color. */
 
   /* This numset is responsible for giving out numbers for each screen */
diff --git a/src/screen.c b/src/screen.c
index b9bb696..0d45701 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -236,6 +236,7 @@ init_global_screen (rp_global_screen *s)
   int screen_num;
 
   screen_num = DefaultScreen (dpy);
+  s->root = RootWindow (dpy, screen_num);
 
   s->numset = numset_new ();
   s->fg_color = BlackPixel (dpy, screen_num);
-- 
2.10.0