PieMenu
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Invoking PieMenu in a certain condition displays 2 PieMenus glitch

Reproduce:
- Click tab to invoke PieMenu
- move mouse over
- press esc
- press tab Result: screen flickers with 2 PieMenus until the previous one disappears
Running PieMenu b04d6bc OS: "Manjaro Linux" Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.18.14959 (Git) AppImage Build type: Release Branch: master Hash: ff05101b68dc9a7d1e70dd69544f14ac8598a433 Python version: 2.7.6 Qt version: 4.8.6 Coin version: 4.0.0a OCC version: 7.3.0 Locale: English/UnitedStates (en_US)