Version 5.1.0 (2022-06-22)

Added

• Options wrapping \tl_if_blank:nTF and \tl_if_empty:nTF (issue #179)
  • Option IfBlankTF
  • Option IfBlankT
  • Option IfBlankF
  • Option IfEmptyTF
  • Option IfEmptyT
  • Option IfEmptyF
• Options to insert code at begin and end of floats (issue #172)
  • Option before float
  • Option after float
  • Option before float app
  • Option before float pre
  • Option after float app
  • Option after float pre
• Library skins: overlap of lower part for bicolor, tile, and beamer
  made configurable (issue #166) by
  • Option overlaplower
  • \tcboverlaplower
• Library documentation: package warning, if imakeidx is loaded after the
  library is loaded (issue #173)
• Library documentation: gather index LaTeX macros and configure gathering (issue #174)
  • Option doclang/commands
  • Option index gather colors
  • Option index gather commands
  • Option index gather counters
  • Option index gather environments
  • Option index gather keys
  • Option index gather lengths
  • Option index gather paths
  • Option index gather values
  • Option index gather all
  • Option index gather none

Changed

• Required latex2e specified \NeedsTeXFormat{LaTeX2e}[2020/10/01] (issue #170)
• Documentation: comment default setting for every box on higher layers (issue #168)
• Documentation: hyperlinking keys and commands where not already done inside
  the listings section (part of issue #175)
• All contents of library xparse are moved to the tcolorbox main package and
  to libraries listings and fitting respectively. xparse now only loads
  the package xparse (issue #180)
• Internal implementation of all \new* commands, e.g. \newtcolorbox changed.
  Note that a missing backlash for tcbox-like commands
  e.g. \newtcbox{mybox} instead of \newtcbox{\mybox} is no longer tolerated.

Fixed

• With parbox=false, before skip was ignored in inner box (issue #171)