[metacity/wip/muktupavels/issue-26: 4/4] display: put windows with same WM_CLASS in tab list group

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 519c5bdb98fbb56cd931b200f1335d524fd8685a
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Oct 9 18:09:58 2022 +0300

    display: put windows with same WM_CLASS in tab list group
    
    Use WM_CLASS as last thing to check if window should be shown in
    tab list group. GNOME Shell and xfwm4 use WM_CLASS to decide if
    windows belongs to same application. Also tasklist from libwnck
    does window grouping based on WM_CLASS.
    
    https://gitlab.gnome.org/GNOME/metacity/-/issues/26

 src/core/display.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/src/core/display.c b/src/core/display.c
index eeccf325..17a1a30b 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -4597,6 +4597,12 @@ in_tab_chain (MetaWindow  *window,
 
       if (meta_window_same_client (window, focus_window))
         return TRUE;
+
+      if (window->res_class != NULL &&
+          *window->res_class != '\0' &&
+          focus_window->res_class != NULL &&
+          strcmp (window->res_class, focus_window->res_class) == 0)
+        return TRUE;
     }
 
   return FALSE;