D21190: Use kappa curve as a default implicit curve

[Yuri Chornoivan]

yurchor created this revision.
yurchor added a reviewer: KDE Edu.
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REVISION SUMMARY
  The current default implicit plot 'y∙sinx + x∙cosy = 1' scales badly on the big area. This can be mitigated using some simpler but famous plot.
  
  BUG: 201515

TEST PLAN
  1. Start a new instance of KmPlot
  2. Ctrl+Scroll down until some big numbers appear (500 or something like this)
  3. Choose "Create -> Implicit plot".
  4. No hanging, KmPlot is still accessible.

REPOSITORY
  R334 KmPlot

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D21190

AFFECTED FILES
  kmplot/functioneditor.cpp

To: yurchor, #kde_edu
Cc: kde-edu, narvaez, apol
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