Fix some minor problems

* seat.c (DispatchEntryExit): Understand all kinds of entry and
exit events instead of just non-grab ones.
* subcompositor.c (SubcompositorComposite1): Remove redundant
assignment.
* xerror.c (CategorizeClients): Add new assertion.

* tests/select_test.c (verify_sample_text):
(verify_sample_text_multiple): Fix typos.

seat.c

@@ -3622,13 +3622,14 @@ DispatchEntryExit (Subcompositor *subcompositor, XIEnterEvent *event)
   if (!seat)
     return;
 
-  if (event->mode != XINotifyGrab
-      && event->mode != XINotifyUngrab)
-    {
-      /* This is not an event generated by grab activation or
-	 deactivation.  Set the last seen subcompositor, or clear it
-	 on XI_Leave.  The last seen subcompositor is used to
-	 determine the surface to which a grab will be released.  */
+  /* Set the last seen subcompositor, or clear it on XI_Leave.  The
+     last seen subcompositor is used to determine the surface to which
+     a grab will be released.
+
+     All entry and exit events must be respected here, including those
+     resulting from grabs!  Otherwise, if some other client has
+     grabbed the pointer, last_seen_subcompositor will not be kept up
+     to date.  */
 
   if (event->evtype == XI_Leave
       || subcompositor != seat->last_seen_subcompositor)
@@ -3652,7 +3653,6 @@ DispatchEntryExit (Subcompositor *subcompositor, XIEnterEvent *event)
 	  seat->last_seen_subcompositor_window = event->event;
 	}
     }
-    }
 
   if (event->mode == XINotifyUngrab
       && seat->grab_surface)

subcompositor.c

@@ -2852,11 +2852,11 @@ SubcompositorComposite1 (Subcompositor *subcompositor,
 	}
 
       /* This goes down the XCopyArea code path, unless presentation
-	 happened, in which case it does nothing.  */
+	 happened, in which case it does nothing.  No key must be
+	 returned, as the given callback is NULL.  */
       pixman_region32_translate (damage, -subcompositor->min_x,
 				 -subcompositor->min_y);
-      key = RenderFinishRender (subcompositor->target, &copy, NULL,
-				NULL);
+      RenderFinishRender (subcompositor->target, &copy, NULL, NULL);
       pixman_region32_fini (&copy);
     }
 

tests/select_test.c

@@ -198,7 +198,7 @@ verify_sample_text (Time time)
     die ("pipe");
 
   display_string = DisplayString (display->x_display);
-  time = sprintf (time_buffer, "%lu", time);
+  sprintf (time_buffer, "%lu", time);
   pid = fork ();
 
   if (pid == -1)
@@ -264,7 +264,7 @@ verify_sample_text_multiple (Time time)
     die ("pipe");
 
   display_string = DisplayString (display->x_display);
-  time = sprintf (time_buffer, "%lu", time);
+  sprintf (time_buffer, "%lu", time);
   pid = fork ();
 
   if (pid == -1)

xerror.c

@@ -229,6 +229,8 @@ CategorizeClients (struct wl_list *client_list,
 	  clients[i - 1] = client;
 	}
     }
+
+  XLAssert (i == wl_list_length (client_list));
 }
 
 static void