Evas text: set NULL free'd pointers in evas_object_text_free()
_render_pre() function could be called for an object which is
going to be deleted. According to state changes of the object,
text could be recalculated with free'd pointers. It caused an
invalid read and crash.
- Apply D1747.
- Run elementary_test.
- Put any character in elm_entry and change paragraph direction.
- Put any character again.
- It can cause a crash which is caused by invalid read in Evas Text.
Reviewers: herdsman, woohyun, tasn, raster
Subscribers: cedric, jpeg
Differential Revision: https://phab.enlightenment.org/D3445