[Bug 1964541] Re: Cannot rearrange Firefox (snap) browser tabs in Wayland sessions

Olivier Tilloy 1964541 at bugs.launchpad.net
Tue Mar 29 10:23:58 UTC 2022 

When running with MOZ_LOG=WidgetDrag:5 in jammy, this is what I'm seeing
when I drag a tab:

[Parent 82683: Main Thread]: D/WidgetDrag nsDragService::InvokeDragSession
[Parent 82683: Main Thread]: D/WidgetDrag adding target application/x-moz-tabbrowser-tab
[Parent 82683: Main Thread]: D/WidgetDrag adding target text/x-moz-text-internal
[Parent 82683: Main Thread]: D/WidgetDrag invisibleSourceDragBegin
[Parent 82683: Main Thread]: D/WidgetDrag nsDragService::SetDragIcon()
[Parent 82683: Main Thread]: D/WidgetDrag   set drag popup [7fe9ee004000]
[Parent 82683: Main Thread]: D/WidgetDrag nsDragService::StartDragSession
[Parent 82683: Main Thread]: D/WidgetDrag nsDragService::EndDragSession 0

The same action with the same version of the snap in impish is
successful, and has a lot more logs:

[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::InvokeDragSession
[Parent 2923: Main Thread]: D/WidgetDrag adding target application/x-moz-tabbrowser-tab
[Parent 2923: Main Thread]: D/WidgetDrag adding target text/x-moz-text-internal
[Parent 2923: Main Thread]: D/WidgetDrag invisibleSourceDragBegin
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::SetDragIcon()
[Parent 2923: Main Thread]: D/WidgetDrag   set drag popup [7f944ac8dc00]
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::StartDragSession
[Parent 2923: Main Thread]: D/WidgetDrag WindowDragMotionHandler nsWindow 7f9467fd3400 coords [74, 11]
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::Schedule() task eDragTaskMotion window 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::RunScheduledTask() task eDragTaskMotion mTargetWindow 0 mPendingWindow 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::StartDragSession
[Parent 2923: Main Thread]: D/WidgetDrag   start drag session mTargetWindow 7f9467fd3400 mTargetWidget 7f946abd2760
[Parent 2923: Main Thread]: D/WidgetDrag   process motion event
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::UpdateDragAction()
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::SetCanDrop 1
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::ReplyToDragMotion can drop 1
[Parent 2923: Main Thread]: D/WidgetDrag   gdk_drag_status() action 4
[Parent 2923: Main Thread]: D/WidgetDrag   clear mTargetWindow mTargetWidget and other data
[Parent 2923: Main Thread]: D/WidgetDrag   remove task source
[Parent 2923: Main Thread]: D/WidgetDrag WindowDragMotionHandler nsWindow 7f9467fd3400 coords [55, 11]
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::Schedule() task eDragTaskMotion window 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::RunScheduledTask() task eDragTaskMotion mTargetWindow 7f9467fd3400 mPendingWindow 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::StartDragSession
[Parent 2923: Main Thread]: D/WidgetDrag   start drag session mTargetWindow 7f9467fd3400 mTargetWidget 7f946abd2760
[Parent 2923: Main Thread]: D/WidgetDrag   process motion event
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::UpdateDragAction()
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::SetCanDrop 1
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::ReplyToDragMotion can drop 1
[Parent 2923: Main Thread]: D/WidgetDrag   gdk_drag_status() action 4
[Parent 2923: Main Thread]: D/WidgetDrag   clear mTargetWindow mTargetWidget and other data
[Parent 2923: Main Thread]: D/WidgetDrag   remove task source
[Parent 2923: Main Thread]: D/WidgetDrag WindowDragMotionHandler nsWindow 7f9467fd3400 coords [51, 11]
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::Schedule() task eDragTaskMotion window 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::RunScheduledTask() task eDragTaskMotion mTargetWindow 7f9467fd3400 mPendingWindow 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::StartDragSession
[Parent 2923: Main Thread]: D/WidgetDrag   start drag session mTargetWindow 7f9467fd3400 mTargetWidget 7f946abd2760
[Parent 2923: Main Thread]: D/WidgetDrag   process motion event
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::UpdateDragAction()
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::SetCanDrop 1
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::ReplyToDragMotion can drop 1
[Parent 2923: Main Thread]: D/WidgetDrag   gdk_drag_status() action 4
[Parent 2923: Main Thread]: D/WidgetDrag   clear mTargetWindow mTargetWidget and other data
[Parent 2923: Main Thread]: D/WidgetDrag   remove task source
[Parent 2923: Main Thread]: D/WidgetDrag WindowDragMotionHandler nsWindow 7f9467fd3400 coords [51, 11]
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::Schedule() task eDragTaskMotion window 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::RunScheduledTask() task eDragTaskMotion mTargetWindow 7f9467fd3400 mPendingWindow 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::StartDragSession
[Parent 2923: Main Thread]: D/WidgetDrag   start drag session mTargetWindow 7f9467fd3400 mTargetWidget 7f946abd2760
[Parent 2923: Main Thread]: D/WidgetDrag   process motion event
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::UpdateDragAction()
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::SetCanDrop 1
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::ReplyToDragMotion can drop 1
[Parent 2923: Main Thread]: D/WidgetDrag   gdk_drag_status() action 4
[Parent 2923: Main Thread]: D/WidgetDrag   clear mTargetWindow mTargetWidget and other data
[Parent 2923: Main Thread]: D/WidgetDrag   remove task source
[Parent 2923: Main Thread]: D/WidgetDrag WindowDragMotionHandler nsWindow 7f9467fd3400 coords [47, 10]
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::Schedule() task eDragTaskMotion window 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::RunScheduledTask() task eDragTaskMotion mTargetWindow 7f9467fd3400 mPendingWindow 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::StartDragSession
[Parent 2923: Main Thread]: D/WidgetDrag   start drag session mTargetWindow 7f9467fd3400 mTargetWidget 7f946abd2760
[Parent 2923: Main Thread]: D/WidgetDrag   process motion event
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::UpdateDragAction()
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::SetCanDrop 1
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::ReplyToDragMotion can drop 1
[Parent 2923: Main Thread]: D/WidgetDrag   gdk_drag_status() action 4
[Parent 2923: Main Thread]: D/WidgetDrag   clear mTargetWindow mTargetWidget and other data
[Parent 2923: Main Thread]: D/WidgetDrag   remove task source
[Parent 2923: Main Thread]: D/WidgetDrag WindowDragMotionHandler nsWindow 7f9467fd3400 coords [44, 10]
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::Schedule() task eDragTaskMotion window 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::RunScheduledTask() task eDragTaskMotion mTargetWindow 7f9467fd3400 mPendingWindow 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::StartDragSession
[Parent 2923: Main Thread]: D/WidgetDrag   start drag session mTargetWindow 7f9467fd3400 mTargetWidget 7f946abd2760
[Parent 2923: Main Thread]: D/WidgetDrag   process motion event
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::UpdateDragAction()
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::SetCanDrop 1
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::ReplyToDragMotion can drop 1
[Parent 2923: Main Thread]: D/WidgetDrag   gdk_drag_status() action 4
[Parent 2923: Main Thread]: D/WidgetDrag   clear mTargetWindow mTargetWidget and other data
[Parent 2923: Main Thread]: D/WidgetDrag   remove task source
[Parent 2923: Main Thread]: D/WidgetDrag WindowDragMotionHandler nsWindow 7f9467fd3400 coords [41, 10]
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::Schedule() task eDragTaskMotion window 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::RunScheduledTask() task eDragTaskMotion mTargetWindow 7f9467fd3400 mPendingWindow 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::StartDragSession
[Parent 2923: Main Thread]: D/WidgetDrag   start drag session mTargetWindow 7f9467fd3400 mTargetWidget 7f946abd2760
[Parent 2923: Main Thread]: D/WidgetDrag   process motion event
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::UpdateDragAction()
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::SetCanDrop 1
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::ReplyToDragMotion can drop 1
[Parent 2923: Main Thread]: D/WidgetDrag   gdk_drag_status() action 4
[Parent 2923: Main Thread]: D/WidgetDrag   clear mTargetWindow mTargetWidget and other data
[Parent 2923: Main Thread]: D/WidgetDrag   remove task source
[Parent 2923: Main Thread]: D/WidgetDrag WindowDragMotionHandler nsWindow 7f9467fd3400 coords [40, 10]
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::Schedule() task eDragTaskMotion window 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::RunScheduledTask() task eDragTaskMotion mTargetWindow 7f9467fd3400 mPendingWindow 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::StartDragSession
[Parent 2923: Main Thread]: D/WidgetDrag   start drag session mTargetWindow 7f9467fd3400 mTargetWidget 7f946abd2760
[Parent 2923: Main Thread]: D/WidgetDrag   process motion event
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::UpdateDragAction()
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::SetCanDrop 1
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::ReplyToDragMotion can drop 1
[Parent 2923: Main Thread]: D/WidgetDrag   gdk_drag_status() action 4
[Parent 2923: Main Thread]: D/WidgetDrag   clear mTargetWindow mTargetWidget and other data
[Parent 2923: Main Thread]: D/WidgetDrag   remove task source
[Parent 2923: Main Thread]: D/WidgetDrag WindowDragMotionHandler nsWindow 7f9467fd3400 coords [38, 9]
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::Schedule() task eDragTaskMotion window 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::RunScheduledTask() task eDragTaskMotion mTargetWindow 7f9467fd3400 mPendingWindow 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::StartDragSession
[Parent 2923: Main Thread]: D/WidgetDrag   start drag session mTargetWindow 7f9467fd3400 mTargetWidget 7f946abd2760
[Parent 2923: Main Thread]: D/WidgetDrag   process motion event
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::UpdateDragAction()
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::SetCanDrop 1
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::ReplyToDragMotion can drop 1
[Parent 2923: Main Thread]: D/WidgetDrag   gdk_drag_status() action 4
[Parent 2923: Main Thread]: D/WidgetDrag   clear mTargetWindow mTargetWidget and other data
[Parent 2923: Main Thread]: D/WidgetDrag   remove task source
[Parent 2923: Main Thread]: D/WidgetDrag WindowDragMotionHandler nsWindow 7f9467fd3400 coords [37, 9]
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::Schedule() task eDragTaskMotion window 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::RunScheduledTask() task eDragTaskMotion mTargetWindow 7f9467fd3400 mPendingWindow 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::StartDragSession
[Parent 2923: Main Thread]: D/WidgetDrag   start drag session mTargetWindow 7f9467fd3400 mTargetWidget 7f946abd2760
[Parent 2923: Main Thread]: D/WidgetDrag   process motion event
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::UpdateDragAction()
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::SetCanDrop 1
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::ReplyToDragMotion can drop 1
[Parent 2923: Main Thread]: D/WidgetDrag   gdk_drag_status() action 4
[Parent 2923: Main Thread]: D/WidgetDrag   clear mTargetWindow mTargetWidget and other data
[Parent 2923: Main Thread]: D/WidgetDrag   remove task source
[Parent 2923: Main Thread]: D/WidgetDrag WindowDragLeaveHandler()
[Parent 2923: Main Thread]: D/WidgetDrag WindowDragLeaveHandler nsWindow 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::Schedule() task eDragTaskLeave window 0
[Parent 2923: Main Thread]: D/WidgetDrag WindowDragDropHandler nsWindow 7f9467fd3400 coords [37,9]
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::Schedule() task eDragTaskDrop window 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::RunScheduledTask() task eDragTaskDrop mTargetWindow 7f9467fd3400 mPendingWindow 7f9467fd3400
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::StartDragSession
[Parent 2923: Main Thread]: D/WidgetDrag   start drag session mTargetWindow 7f9467fd3400 mTargetWidget 7f946abd2760
[Parent 2923: Main Thread]: D/WidgetDrag   process drop task
[Parent 2923: Main Thread]: D/WidgetDrag   drag finished
[Parent 2923: Main Thread]: D/WidgetDrag nsDragService::EndDragSession 1
[Parent 2923: Main Thread]: D/WidgetDrag   clear mTargetWindow mTargetWidget and other data
[Parent 2923: Main Thread]: D/WidgetDrag   remove task source
[Parent 2923: Main Thread]: D/WidgetDrag WindowDragLeaveHandler()
[Parent 2923: Main Thread]: D/WidgetDrag     Failed - GetMostRecentDestWindow()!
[Parent 2923: Main Thread]: D/WidgetDrag invisibleSourceDragEnd
[Parent 2923: Main Thread]: D/WidgetDrag SourceEndDragSession result 0

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Title:
  Cannot rearrange Firefox (snap) browser tabs in Wayland sessions

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