D23586: Improve code that detects useful elements in an Svg file

[Aleix Pol Gonzalez]

apol marked an inline comment as done.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D23586

To: apol, #plasma, #frameworks
Cc: gladhorn, kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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