D7582: [FrameSvgItem] Create margins/fixedMargins object on demand

[Kai Uwe Broulik]

broulik created this revision.
Restricted Application added projects: Plasma, Frameworks.
Restricted Application added subscribers: Frameworks, plasma-devel.

REVISION SUMMARY
  On my machine I end up creating 490 margins and 490 fixed margin objects.
  After this change I only create 171 margin objects and 20 fixed margin objects.

TEST PLAN
  RAM consumption negligible and 0.1ms time saved but especially given fixed margins is hardly used, imho shouldn't create a ton of objects that are unused.
  
  Changing themes seems fine.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D7582

AFFECTED FILES
  src/declarativeimports/core/framesvgitem.cpp
  src/declarativeimports/core/framesvgitem.h

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