D6392: [Panel Config] Scrolling over size button increments size by 2 and shows current thickness

[Chris Holland]

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REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D6392

To: Zren, #plasma
Cc: davidedmundson, broulik, plasma-devel, ZrenBot, progwolff, lesliezhai, 
ali-mohamed, jensreuterberg, abetts, sebas, apol, mart