[libwnck/wip/muktupavels/icons: 1/5] screen: store WnckHandle in struct

[Alberts Muktupāvels <muktupavels src gnome org>]

commit a886961c98db21eb47e95b9f5223f7788ab70e57
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Dec 26 15:32:44 2021 +0200

    screen: store WnckHandle in struct
    
    Before 5ab809143a7d commit event filter was added in wnck_screen_get
    when constructing first screen. Store WnckHandle in WnckScreen struct
    to ensure that event filter is always added otherwise we might end up
    without event filter if on startup nothing calls _wnck_get_handle.
    
    This change introduces new requirement - wnck_set_client_type must be
    used before using WnckScreen APIs.

 libwnck/screen.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/libwnck/screen.c b/libwnck/screen.c
index d6db387..748ffc7 100644
--- a/libwnck/screen.c
+++ b/libwnck/screen.c
@@ -69,6 +69,8 @@ static WnckScreen** screens = NULL;
 
 struct _WnckScreenPrivate
 {
+  WnckHandle *handle;
+
   int number;
   Window xroot;
   Screen *xscreen;
@@ -529,6 +531,8 @@ wnck_screen_construct (Display    *display,
                        WnckScreen *screen,
                        int         number)
 {
+  screen->priv->handle = _wnck_get_handle ();
+
   /* Create the initial state of the screen. */
   screen->priv->xroot = RootWindow (display, number);
   screen->priv->xscreen = ScreenOfDisplay (display, number);