[Lazarus] Strange message from window manager

[Michael Van Canneyt]

Hello,

I'm getting heaps of this kind of warnings:

Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x2000038 (Lazarus)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x2000065 (MainIDE)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x2000065 (MainIDE)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x2000065 (MainIDE)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x2000065 (MainIDE)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x200006b (Project In)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x200006b (Project In)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x200006b (Project In)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x200006b (Project In)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003dd (Components)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003dd (Components)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003dd (Components)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003dd (Components)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003e4 (Messages)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003e4 (Messages)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003e4 (Messages)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003e4 (Messages)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003ea (Object Ins)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003ea (Object Ins)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003ea (Object Ins)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003ea (Object Ins)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003f9 (Source Edi)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003f9 (Source Edi)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003f9 (Source Edi)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003f9 (Source Edi)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003f9 (Source Edi)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003f9 (Source Edi)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003f9 (Source Edi)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003f9 (Source Edi)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x2000065 (Lazarus ID)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x2000065 (Lazarus ID)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003dd (Components)
Cinnamon warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x20003dd (Components)

Any idea what causes this ?

Michael.