elm_genlist: unhighlight item if it not selected

Summary:
Main trouble in handle click and double click event.
If user hold Esc and do double click on genlist item,
it still highlighted but not selected, because between
click and double click genlist process a key down event.
This patch add check the item state on mouse up, check
a item state - if item highlighted but not selected,
unhighlight it.

@fix
Fixes T3986

Test Plan:
1. run elementary_test Genlist
2. hold ESC
3. double-click on few genlist items

Reviewers: raster, cedric, NikaWhite

Subscribers: seoz, jpeg

Maniphest Tasks: T3986

Differential Revision: https://phab.enlightenment.org/D4222

src/lib/elementary/elm_genlist.c

@@ -4939,6 +4939,9 @@ _item_mouse_up_cb(void *data,
           }
      }
 
+   if (!it->selected && it->highlighted)
+     _item_unhighlight(it);
+
    if ((ev->flags != EVAS_BUTTON_NONE) ||
        (ev->event_flags & EVAS_EVENT_FLAG_ON_HOLD) ||
        !it->base->still_in ||