gtk: add tab to trace events

So you can see which of multiple displays (if present) was resized ;)
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

trace-events

@@ -1045,9 +1045,9 @@ displaychangelistener_unregister(void *dcl, const char *name) "%p [ %s ]"
 ppm_save(const char *filename, void *display_surface) "%s surface=%p"
 
 # ui/gtk.c
-gd_switch(int width, int height) "width=%d, height=%d"
-gd_update(int x, int y, int w, int h) "x=%d, y=%d, w=%d, h=%d"
-gd_key_event(int gdk_keycode, int qemu_keycode, const char *action) "translated GDK keycode %d to QEMU keycode %d (%s)"
+gd_switch(const char *tab, int width, int height) "tab=%s, width=%d, height=%d"
+gd_update(const char *tab, int x, int y, int w, int h) "tab=%s, x=%d, y=%d, w=%d, h=%d"
+gd_key_event(const char *tab, int gdk_keycode, int qemu_keycode, const char *action) "tab=%s, translated GDK keycode %d to QEMU keycode %d (%s)"
 
 # ui/input.c
 input_event_key_number(int conidx, int number, bool down) "con %d, key number 0x%x, down %d"

ui/gtk.c

@@ -355,7 +355,7 @@ static void gd_update(DisplayChangeListener *dcl,
     int fbw, fbh;
     int ww, wh;
 
-    trace_gd_update(x, y, w, h);
+    trace_gd_update(vc->label, x, y, w, h);
 
     if (vc->gfx.convert) {
         pixman_image_composite(PIXMAN_OP_SRC, vc->gfx.ds->image,
@@ -461,7 +461,7 @@ static void gd_switch(DisplayChangeListener *dcl,
     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
     bool resized = true;
 
-    trace_gd_switch(surface_width(surface), surface_height(surface));
+    trace_gd_switch(vc->label, surface_width(surface), surface_height(surface));
 
     if (vc->gfx.surface) {
         cairo_surface_destroy(vc->gfx.surface);
@@ -815,7 +815,7 @@ static gboolean gd_key_event(GtkWidget *widget, GdkEventKey *key, void *opaque)
     }
 #endif
 
-    trace_gd_key_event(gdk_keycode, qemu_keycode,
+    trace_gd_key_event(vc->label, gdk_keycode, qemu_keycode,
                        (key->type == GDK_KEY_PRESS) ? "down" : "up");
 
     for (i = 0; i < ARRAY_SIZE(modifier_keycode); i++) {