D17025: Perf: Do expensive regexp construction earlier

[Kevin Funk]

kfunk created this revision.
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REVISION SUMMARY
  SystemTray::serviceRegistered is called tons of times; the regexp
  construction inside the for-loop is expensive and should be avoided.
  Thus construct the regexp once, and re-use the regexp object each time.

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D17025

AFFECTED FILES
  applets/systemtray/systemtray.cpp
  applets/systemtray/systemtray.h

To: kfunk
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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