Failing unittest: KisAutoBrushTest

[Boudewijn Rempt]

This test started failing recently (in master):

********* Start testing of KisAutoBrushTest *********
Config: Using QtTest library 5.14.1, Qt 5.14.1 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 7.4.0)
PASS   : KisAutoBrushTest::initTestCase()
PASS   : KisAutoBrushTest::testCreation()
PASS   : KisAutoBrushTest::testMaskGeneration()
QDEBUG : KisAutoBrushTest::testDabSize() "Identity"
QDEBUG : KisAutoBrushTest::testDabSize() "Double"
QDEBUG : KisAutoBrushTest::testDabSize() "Halve"
QDEBUG : KisAutoBrushTest::testDabSize() "180 deg"
QDEBUG : KisAutoBrushTest::testDabSize() "90 deg"
QDEBUG : KisAutoBrushTest::testDabSize() "-90 deg"
QDEBUG : KisAutoBrushTest::testDabSize() "45 deg"
QDEBUG : KisAutoBrushTest::testDabSize() "2x, 45d"
QDEBUG : KisAutoBrushTest::testDabSize() "0.5x, 45d"
QDEBUG : KisAutoBrushTest::testDabSize() "0.5x, 45d"
QDEBUG : KisAutoBrushTest::testDabSize() "0.5y"
FAIL!  : KisAutoBrushTest::testDabSize() Compared values are not the same
   Actual   (brush->maskHeight(shape, 0.0, 0.0, KisPaintInformation())): 3
   Expected (expectedHeight)                                           : 5
   Loc: [/home/boud/dev/krita/libs/brush/tests/kis_auto_brush_test.cpp(99)]
QWARN  : KisAutoBrushTest::testCopyMasking() KoColor debug runtime checks are active.
PASS   : KisAutoBrushTest::testCopyMasking()
PASS   : KisAutoBrushTest::testClone()
PASS   : KisAutoBrushTest::cleanupTestCase()
Totals: 6 passed, 1 failed, 0 skipped, 0 blacklisted, 121ms
********* Finished testing of KisAutoBrushTest *********

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