Designmode issues with TShellListView in gtk2

• Lazarus/FPC Version: Laz/main + FPC 3.2.2, Laz 3.4 + FPC 3.2.2, gtk2 in all cases
• Operating System: Kubuntu 24.04.1 and Manjaro 22.05 (in the latter one, using also Laz 3.0)
• CPU / Bitness: Virtual machine on Windows 11 host (Intel, 64 bit)

What happens / Steps to reproduce

Drop a TShellListview on an empty form of a new project --> the control either does not show up, or cannot be selected or moved with the mouse. In any case attempting to delete the control results in a non-responding IDE.

The issue occurs only on gtk2. On Win32/64 or on qt5/qt6 or on cocoa, the behaviour is correct.

This report is based on the forum discussion https://forum.lazarus.freepascal.org/index.php/topic,69242.msg537839.