[GRASS-git] [OSGeo/grass] c8103d: wxGUI: update wx4.1.0 support for FlatNotebook (#856)

[nilason]

  Branch: refs/heads/releasebranch_7_8
  Home:   https://github.com/OSGeo/grass
  Commit: c8103db075d154e23772539c308cb635ba6e5116
      https://github.com/OSGeo/grass/commit/c8103db075d154e23772539c308cb635ba6e5116
  Author: nilason <n_larsson at yahoo.com>
  Date:   2020-08-21 (Fri, 21 Aug 2020)

  Changed paths:
    M gui/wxpython/core/globalvar.py
    M gui/wxpython/dbmgr/base.py
    M gui/wxpython/gmodeler/frame.py
    M gui/wxpython/lmgr/frame.py
    M gui/wxpython/modules/import_export.py
    M gui/wxpython/psmap/frame.py
    M gui/wxpython/tplot/frame.py
    M gui/wxpython/vnet/dialogs.py
    M gui/wxpython/web_services/widgets.py

  Log Message:
  -----------
  wxGUI: update wx4.1.0 support for FlatNotebook (#856)

addresses two separate, but interlinked issues:
- addition of FlatNotebook.FNB_NODRAG window style flag to prevent
  macOS GUI crash on switching tabs
- dark mode support