D24157: [Cursor KCM] Restore live preview on hover

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, VDG.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  When hovering a cursor in the delegate, it changes the mouse cursor to it.
  While at it, modernize, i.e. nullptr, range-for, `KWindowSystem::isPlatformX11()`, coding style

TEST PLAN
  - Moved my mouse through the delegates, got a live cursor for all the cursors and all the themes
  
  F7416457: Screenshot_20190923_145953.png <https://phabricator.kde.org/F7416457>

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D24157

AFFECTED FILES
  kcms/cursortheme/xcursor/previewwidget.cpp

To: broulik, #plasma, #vdg
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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