Allow theming visibleRange for pager

[SerhiiTsybulskyi]

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[amcdnl]

This name isn't the most obvious - What about showPageCount or something ?

[SerhiiTsybulskyi]

showPageCount it not suitable, need to define only visible (shown) items

maybe shownItems will be better.
What do you think?

[amcdnl]

how about - showPageRange

[SerhiiTsybulskyi]

good for me, I'll update