Some doc stuff first:
void evas_object_text_ellipsis_set ( Evas_Object * obj, double ellipsis )
Sets the ellipsis that should be used for the text object.
This is a value between 0.0 and 1.0 indicating the position of the text to be shown. 0.0 means the start will be shown and the end trimmed, 1.0 means the beginning will be trimmed and the end will be shown, and any value in between will cause ellipsis to be added in both end of the text and the requested part to be shown. -1.0 means ellipsis is turned off.
Sets ellipsis mode. The value should be a number. Any value smaller than 0.0 or greater than 1.0 disables ellipsis. A value of 0 means ellipsizing the leftmost portion of the text first, 1 on the other hand the rightmost portion.
ellipsis value = 0.5
Text = ABCDrrrrrEFGH
According to documentation both behavior is correct but why these two are different?