D9119: Initialize scale factor to the last scale factor set on any instance

[Eike Hein]

hein added a comment.


  So I worked out why this happens. We have API like this:
  
  SvgItem {
  
    svg: Svg { imagePath: "..." }
  
  }
  
  Without my patch, `Svg` is instanciated with a scale factor of 1.0 always. Then `setImagePath` is called on it first. Then `SvgItem::setSvg` is called with the `Svg` instance and calls `setScaleFactor` on it.
  
  In this pattern, `SvgItem` doesn't get a chance to set the scale factor before `imagePath`, because it's not the one setting the latter.
  
  The only call site fix here would be to implement `QQmlParserStatus` in `Svg` and then set `scaleFactor` from QML everywhere by accessing `Units`. But this hygiene would be really hard to enforce, especially in third-party widgets.
  
  I still consider my patch to be a fairly pragmatic solution to this.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D9119

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