FIX: [STUDIO-4125] null crash in ImageGrid
Change-Id: Ibe2fcf6d3fe7ae901a2e594d782566a04aa19c39 Jira: STUDIO-4125
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@ -220,6 +220,7 @@ void ImageGrid::UpdateLayout()
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void Slic3r::GUI::ImageGrid::UpdateFocusRange()
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{
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if (!m_file_sys) return;
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wxSize size = GetClientSize();
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wxPoint off;
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int index = firstItem(size, off);
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