_content_show() function was used in page_info_geometry_change() and
_efl_page_transition_scroll_loop_set() function since they need to
show/hide page info objects in common. but using a common function
made each function inefficient and buggy.
this patch removes _content_show() function.
since page_infos are connected in a circular manner,
one node (head or tail) moves in the opposite direction when scrolled.
there was a bug in hiding such nodes and
this patch fixes it.
Summary: if target is null, then terminate the function because it is not intended.
Test Plan: N/A
Reviewers: eunue
Reviewed By: eunue
Subscribers: cedric, #reviewers, #committers
Tags: #efl
Differential Revision: https://phab.enlightenment.org/D7127
Efl.Ui.Pager is a widget which contains many pages in a linear fashion
and allows users to scroll through them.
Users can attach Efl.Page.Transition and Efl.Page.Indicator to a pager.