Fix ListBox crash when resizing star-width columns

Status: Fixed
Fixed in: v26.6.6
Source discussion: https://forum.objo.dev/d/435-app-crashes-with-exit-code-134
Last updated: 2026-06-25

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Public summary

Resizing a desktop app window containing a ListBox with flexible column widths can crash the app with exit code 134. The crash occurs during a narrow horizontal resize when Avalonia recalculates DataGrid star column widths and receives a non-finite value. ListBox column width updates should not re-enter Avalonia column sizing while the framework is processing the resize notification.