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[Phill <1196926@xxxxxxxxxxxxxxxxxx>]

Although this fix stops the user selecting a display size smaller than
0, it does not appear prevent the bug in the support tracker issue that
is attached.

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https://bugs.launchpad.net/bugs/1196926

Title:
  Zero division error when display size set to zero

Status in OpenLP - Worship Presentation Software:
  Fix Committed
Status in OpenLP 2.0 series:
  Fix Committed
Status in OpenLP trunk series:
  Fix Committed

Bug description:
  Orriginally reported at: http://support.openlp.org/issues/1980

  However, I've been able to trigger this by a different method:

  Open the "Configure OpenLP" dialog
  Set hight or width to 0 for the "Override display position" option
  Click ok.

  This produces this traceback:

  Traceback (most recent call last):
    File "D:\OpenLP_Code\release-2.0.1\build\pyi.win32\OpenLP\out00-PYZ.pyz\openlp.core.ui.mainwindow", line 1155, in screenChanged
    File "D:\OpenLP_Code\release-2.0.1\build\pyi.win32\OpenLP\out00-PYZ.pyz\openlp.core.lib.renderer", line 95, in update_display
    File "D:\OpenLP_Code\release-2.0.1\build\pyi.win32\OpenLP\out00-PYZ.pyz\openlp.core.lib.renderer", line 355, in _calculate_default
  ZeroDivisionError: float division by zero

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