problem when adding tabs dynamically

[m7mdyahia]

There is problem when adding tabs dynamically it casuse
"
IllegalStateException: The application's PagerAdapter changed the adapter's content without calling PagerAdapter#notifyDataSetChanged
"

this commit by @NDrive partially fixes it
NDrive@8bfe720

there is still problems in this case
load the tabs with 3 tabs
then dynamically add a 4th one
then try to scroll back
the 2nd is diplayed not the third

[Asad4429]

same issue for me