Evas textblock: Correct word start/end moving at new line or line begins with spaces

Summary:
Word start/end works incorrectly when it goes to new line or line begins with spaces.
Ex: In elementary_test/Entry, place cursor at the end of line, press ctrl + right arrow keys: cursor moves to begin of next line. In this case, cursor should move to end of 1st word in next line.
Ex2: In elementary_test/Entry, add some spaces to begin of 2nd line ("   uses markup"), place cursor at the first word ("uses"), press ctrl + left arrow keys twice, cursor moves to begin of 2nd line. In this case, cursor should move to begin of last word in 1st line.

This patch provides a fix by considerring next/previous text node to move cursor to correct place.

@fix

Reviewers: woohyun, raster, tasn

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D1140

src/lib/evas/canvas/evas_object_textblock.c

@@ -7349,7 +7349,23 @@ evas_textblock_cursor_word_start(Evas_Textblock_Cursor *cur)
 
    for (i = cur->pos ; _is_white(text[i]) && BREAK_AFTER(i) ; i--)
      {
-        if (i == 0) break;
+        if (i == 0)
+          {
+             Evas_Object_Textblock_Node_Text *pnode;
+             pnode = _NODE_TEXT(EINA_INLIST_GET(cur->node)->prev);
+             if (pnode)
+               {
+                  cur->node = pnode;
+                  len = eina_ustrbuf_length_get(cur->node->unicode);
+                  cur->pos = len - 1;
+                  free(breaks);
+                  return evas_textblock_cursor_word_start(cur);
+               }
+             else
+               {
+                  break;
+               }
+          }
      }
 
    for ( ; i > 0 ; i--)
@@ -7390,6 +7406,18 @@ evas_textblock_cursor_word_end(Evas_Textblock_Cursor *cur)
      }
 
    for (i = cur->pos; text[i] && _is_white(text[i]) && (BREAK_AFTER(i)) ; i++);
+   if (i == len)
+     {
+        Evas_Object_Textblock_Node_Text *nnode;
+        nnode = _NODE_TEXT(EINA_INLIST_GET(cur->node)->next);
+        if (nnode)
+          {
+             cur->node = nnode;
+             cur->pos = 0;
+             free(breaks);
+             return evas_textblock_cursor_word_end(cur);
+          }
+     }
 
    for ( ; text[i] ; i++)
      {

src/tests/evas/evas_test_textblock.c

@@ -637,6 +637,18 @@ START_TEST(evas_textblock_cursor)
 
         evas_textblock_cursor_word_end(cur);
         ck_assert_int_eq(5, evas_textblock_cursor_pos_get(cur));
+
+        /* moving across paragraphs */
+        evas_object_textblock_text_markup_set(tb,
+                                              "test<ps/>"
+                                              "  case");
+        evas_textblock_cursor_pos_set(cur, 4);
+        evas_textblock_cursor_word_end(cur);
+        ck_assert_int_eq(10, evas_textblock_cursor_pos_get(cur));
+
+        evas_textblock_cursor_pos_set(cur, 6);
+        evas_textblock_cursor_word_start(cur);
+        ck_assert_int_eq(0, evas_textblock_cursor_pos_get(cur));
      }
 
    /* Make sure coords are correct for ligatures */