App crashes with exit code 134

AndiG

When my window with listbox is resized, the app crashes

This is my test app: https://magentacloud.de/s/REBdeLNXPd78H6D

When I reduce the size of the window horizontally, at a certain moment, the listbox changes the column sizes and when I release the mouse button, the app crashes immediately.

Objo Studio Version

26.6.5

Operating System

macOS 26.5.1

Screenshots, Logs, Or Sample Project

rgb

AndiG

Hi @AndiG ,

Create a method name checkSize by example

Sub checkSize()
If Me.Width < 580 Then Me.Width = 580
If Me.Height < 430 Then Me.Height = 430

Put your code inside
And in Event Resize call method checkSize

Event Resize()
checkSize()

Garry

Thanks for the report and sample project.

I’ve now been able to reproduce the underlying crash. It happens when a ListBox with flexible/star column widths is resized very narrowly while Avalonia is recalculating the internal DataGrid column widths. In some resize states this can produce a non-finite column width, which causes the desktop host to abort with exit code 134.

The Resize() handler workaround that clamps the window width avoids the crash by preventing the ListBox from reaching the bad layout state, but the underlying issue is in Objo’s ListBox runtime code.

I’ve fixed this so ListBox column width recalculation no longer re-enters Avalonia’s column sizing while a resize notification is still being processed. The fix will be included in the next Objo Studio release: https://feedback.objo.dev/bug/523

AndiG

Thank you again for the fast fixes!

As I checked my little app again (doing the horizontal resize), I recognized, that before the size is at the point that leads to a crash, the Listbox PaintHeaderBackground method is not filling correctly anymore. Please take a look again and do a slow resize on the window, you'll see what I mean.

Garry

I'm not able to reproduce this so I'm wondering if the change I have made on the dev branch have resolved it 🤞

AndiG

Garry Your changes in 26.6.6 fixed the PaintHeaderBackground problem, too. Thank you again!

AndiG

Ok, I'll wait for the next version to check this again.