Set and use column_data_t::is_current in filelist
Add OtherLine color pair
Account for unset attr in color_scheme::mix_colors
Add OtherLine hi group for cursor of inactive pane

Thanks to Svyatoslav Mishyn, a.k.a. juef.
Simplify code in filelist:plepare_*_col_color()
Fix other cursor redraw on inactive view redraw
Merge branch 'add-inactive-cursor-hi-group'

Add OtherLine highlight group for cursor of inactive pane.

Thanks to Svyatoslav Mishyn, a.k.a. juef.