Textblock : Fix cursor cluster movement when emoji at the line start

Textblock : Fix cursor cluster movement when emoji at the line start

Summary:
if we have emoji only or emoji at line start we can move cursor using mouse click to be inside the emoji.

{F3868502}

this should fix T8664

Test Plan:
  #include <Elementary.h>

  EAPI_MAIN int
  elm_main(int argc EINA_UNUSED, char **argv EINA_UNUSED)
  {
     Evas_Object *win;

     elm_policy_set(ELM_POLICY_QUIT, ELM_POLICY_QUIT_LAST_WINDOW_CLOSED);
     win = elm_win_util_standard_add("emoji-test", "emoji-test");
     elm_win_autodel_set(win, EINA_TRUE);

     /* and now just resize the window to a size you want. normally widgets
      * will determine the initial size though */
     evas_object_resize(win, 320, 320);

     Evas_Object *box;
     box = elm_box_add(win);
     evas_object_size_hint_weight_set(box, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
     evas_object_size_hint_align_set(box, EVAS_HINT_FILL, EVAS_HINT_FILL);
     elm_win_resize_object_add(win, box);

     Evas_Object *entry;
     entry = elm_entry_add(box);

     elm_entry_entry_set(entry, "&#x262a;&#xfe0f;");

     evas_object_size_hint_weight_set(entry, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
     evas_object_size_hint_align_set(entry, EVAS_HINT_FILL, EVAS_HINT_FILL);

     elm_box_pack_end(box, entry);

     evas_object_show(entry);
     evas_object_show(box);

     /* and show the window */
     evas_object_show(win);

     elm_run(); /* and run the program now, starting to handle all
                 * events, etc. */

     /* exit code */
     return 0;
  }
  ELM_MAIN()

Reviewers: ali.alzyod, woohyun, bowonryu, zmike, bu5hm4n

Reviewed By: ali.alzyod

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Maniphest Tasks: T8664

Differential Revision: https://phab.enlightenment.org/D11732