Fix incomplete declaration of QPainterPath

[poke1024]

Fixes the following error when compling against QT 5.15.1:

In file included from ../../../../src/core/Animators/qrealanimator.h:19,
                 from ../../../../src/core/Expressions/propertybinding.cpp:37:
../../../../src/core/Animators/graphanimator.h:105:22: error: field ‘fPath’ has incomplete type ‘QPainterPath’
  105 |         QPainterPath fPath;
      |                      ^~~~~
In file included from /usr/include/qt/QtGui/qtransform.h:43,
                 from /usr/include/qt/QtGui/qimage.h:48,
                 from /usr/include/qt/QtGui/qpixmap.h:49,
                 from /usr/include/qt/QtGui/qpainter.h:48,
                 from /usr/include/qt/QtGui/QPainter:1,
                 from ../../../../src/core/Properties/../MovablePoints/movablepoint.h:21,
                 from ../../../../src/core/Properties/../MovablePoints/pointshandler.h:19,
                 from ../../../../src/core/Properties/property.h:24,
                 from ../../../../src/core/Expressions/propertybindingbase.h:23,
                 from ../../../../src/core/Expressions/propertybinding.h:20,
                 from ../../../../src/core/Expressions/propertybinding.cpp:17:
/usr/include/qt/QtGui/qmatrix.h:54:7: note: forward declaration of ‘class QPainterPath’
   54 | class QPainterPath;
      |       ^~~~~~~~~~~~
In file included from ../../../../src/core/Animators/qrealanimator.h:19,
                 from ../../../../src/core/Expressions/propertybinding.cpp:37:
../../../../src/core/Animators/graphanimator.h: In member function ‘void GraphAnimator::GraphPath::reset()’:
../../../../src/core/Animators/graphanimator.h:102:45: error: invalid use of incomplete type ‘class QPainterPath’
  102 |         void reset() { fPath = QPainterPath(); }
      |                                             ^
In file included from /usr/include/qt/QtGui/qtransform.h:43,
                 from /usr/include/qt/QtGui/qimage.h:48,
                 from /usr/include/qt/QtGui/qpixmap.h:49,
                 from /usr/include/qt/QtGui/qpainter.h:48,
                 from /usr/include/qt/QtGui/QPainter:1,
                 from ../../../../src/core/Properties/../MovablePoints/movablepoint.h:21,
                 from ../../../../src/core/Properties/../MovablePoints/pointshandler.h:19,
                 from ../../../../src/core/Properties/property.h:24,
                 from ../../../../src/core/Expressions/propertybindingbase.h:23,
                 from ../../../../src/core/Expressions/propertybinding.h:20,
                 from ../../../../src/core/Expressions/propertybinding.cpp:17:
/usr/include/qt/QtGui/qmatrix.h:54:7: note: forward declaration of ‘class QPainterPath’
   54 | class QPainterPath;
      |       ^~~~~~~~~~~~
make[2]: *** [Makefile:10708: propertybinding.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory '/home/bernhard/git/enve/build/Release/src/core'
make[1]: *** [Makefile:100: sub-core-make_first] Error 2
make[1]: Leaving directory '/home/bernhard/git/enve/build/Release/src'
make: *** [Makefile:47: sub-src-make_first] Error 2

[eszlari]

@MaurycyLiebner Will you merge this?

[eszlari]

This PR seems to be incomplete, see:

https://github.com/flathub/io.github.maurycyliebner.enve/blob/master/patches/enve-QPainterPath.patch