mixer: lock up the slider for the case a drag is in progress

src/modules/mixer/e_mod_main.c

@@ -127,7 +127,8 @@ static void
 _mixer_popup_update(Instance *inst, int mute, int vol)
 {
    elm_check_state_set(inst->check, !!mute);
-   elm_slider_value_set(inst->slider, vol);
+   if (!evas_object_data_del(inst->slider, "__lock"))
+     elm_slider_value_set(inst->slider, vol);
 }
 
 static void _popup_del(Instance *inst);
@@ -399,6 +400,14 @@ _slider_drag_stop_cb(void *data EINA_UNUSED, Evas_Object *obj,
    Emix_Sink *s = (Emix_Sink *)mixer_context->sink_default;
    int val = s->volume.volumes[0];
    elm_slider_value_set(obj, val);
+   evas_object_data_del(obj, "__lock");
+}
+
+static void
+_slider_drag_start_cb(void *data EINA_UNUSED, Evas_Object *obj,
+                     void *event EINA_UNUSED)
+{
+   evas_object_data_set(obj, "__lock", (void*)1);
 }
 
 static void
@@ -466,6 +475,7 @@ _popup_new(Instance *inst)
    elm_slider_min_max_set(slider, 0.0, emix_max_volume_get());
    evas_object_smart_callback_add(slider, "changed", _slider_changed_cb, NULL);
    evas_object_smart_callback_add(slider, "slider,drag,stop", _slider_drag_stop_cb, NULL);
+   evas_object_smart_callback_add(slider, "slider,drag,start", _slider_drag_start_cb, NULL);
    elm_slider_value_set(slider, volume);
    elm_box_pack_end(bx, slider);
    evas_object_show(slider);