D10558: Also use standard keyboard shortcut for "show/hide hidden files"

[Nathaniel Graham]

ngraham created this revision.
ngraham added a reviewer: Dolphin.
ngraham requested review of this revision.

REVISION SUMMARY
  Use Ctrl+H as the primary keyboard shortcut to show and hide hidden files, as it is already the standard used in all other Linux file managers (Nautilus, Nemo, Caja, Thunar, Pantheon Files). Don't replace any existing shortcuts to retain existing KDE users' muscle menory.
  
  FEATURE: 390527
  FIXED-IN: KDE Applications 17.12.3

TEST PLAN
  - Ctrl+H now shows and hides hidden files
  - Alt+. still works to do the same
  - F8 still works to do the same
  - Toolbar button still changes state appropriately when any of the three shortcuts are used
  - Ctrl+H featured as the primary shortcut in the menu

REPOSITORY
  R318 Dolphin

BRANCH
  use-standard-show-hide-files-shortcut (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D10558

AFFECTED FILES
  src/views/dolphinviewactionhandler.cpp

To: ngraham, #dolphin
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