message: Don't set invalid zoom level when no previous texture size is set
diff: @@ -1121,7 +1121,7 @@ void TextureViewer::UI_OnTextureSelectionChanged(bool newdraw)
  float curArea = area(curSize);
  float prevArea = area(m_PrevSize);
  - if(prevArea > 0.0f)
  + if(prevArea > 0.0f && m_PrevSize.width() > 0.0f)
  {
  float prevX = m_TexDisplay.xOffset;
  float prevY = m_TexDisplay.yOffset;
  