Timeline

Apr 26, 2026: Yesterday

7:41 PM Ticket #4091 (Header painting dysfunctional when subclassed in ListView) updated by Nine

@mattyd - I know about this workaround. In the other track I made, I was also using the listview proc instead of the GUI. But I still think there is a bug here that we should address.

4:51 PM Ticket #4091 (Header painting dysfunctional when subclassed in ListView) updated by MattyD

Guessing this is probably a windows thing as returning _WinAPI_DefWindowProcW instead of $GUI_RUNDEFMSG doesn't change the behavior. The below works in both x64 & x86 when we handle the listview's WM_NOTIFY messages rather than the GUI's. […]

12:08 PM Ticket #4091 (Header painting dysfunctional when subclassed in ListView) updated by mLipok

My note I think that WM_NOTIFY() function registered by GUIRegisterMsg() in x64 is not allways called.

11:42 AM Ticket #4091 (Header painting dysfunctional when subclassed in ListView) created by Nine

The following line is not executed properly when run in x64 while it …

Apr 25, 2026:

4:12 PM Ticket #4090 (GUI freezes with Header subclassing in ListView) created by Nine

It is a very basic example. It may takes a little while to get it …