[Xfce-bugs] [Bug 15730] high CPU usage when `Show flat buttons` is NOT selected in `Window Buttons` xfce4-panel plugin

[bugzilla-daemon at xfce.org]

https://bugzilla.xfce.org/show_bug.cgi?id=15730

--- Comment #2 from howaboutsynergy <howaboutsynergy at pm.me> ---
Interesting, this might be a bug in gtk after all? given my superficial
understanding of things:
(I wonder how I could test this ... maybe I could modify a gtk3 example
somehow?)

so GTK_RELIEF_NORMAL is non-flat buttons

```c
     case PROP_FLAT_BUTTONS:
        xfce_tasklist_set_button_relief (tasklist,                              
                                         g_value_get_boolean (value) ?
                                           GTK_RELIEF_NONE :
GTK_RELIEF_NORMAL);
        break;

...
  static void
  xfce_tasklist_set_button_relief (XfceTasklist   *tasklist,                    
                                   GtkReliefStyle  button_relief)
  {
    GList             *li;
    XfceTasklistChild *child;

    panel_return_if_fail (XFCE_IS_TASKLIST (tasklist));

    if (tasklist->button_relief != button_relief)
      {
        tasklist->button_relief = button_relief;

        /* change the relief of all buttons in the list */
        for (li = tasklist->windows; li != NULL; li = li->next)
          {
            child = li->data;
            gtk_button_set_relief (GTK_BUTTON (child->button),
                                   button_relief);
          }

        /* arrow button for overflow menu */
        gtk_button_set_relief (GTK_BUTTON (tasklist->arrow_button),
                               button_relief);
      }
  }
```

https://developer.gnome.org/gtk3/stable/GtkButton.html#gtk-button-set-relief
The default style is, as one can guess, GTK_RELIEF_NORMAL.

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