Clicking on project explorer not always triggers update event

[kuiperzone]

Note to self. To fix in next release.

[kuiperzone]

Manifests when the user opens a new project and clicks on a (Main) Window in Explorer. The preview is not rendered until the user clicks away on another item, and then back to the Window.

NB. This bug seems only to be repeatable if window has a user control from another assembly.

The issue seems to be in the Design Host. See log below. Connects to Design Host OK, which then delivers only a frame of 1x1 pixel and nothing else : FRAME: 1, 1 x 1 px, 4 bytes

NEW SELECTED: MainWindow.axaml
MainWindow.UpdateLoader
RemoteLoader.Update
RemoteLoader.UpdateThread
Root Name: Window
Is window
RemoteLoader.StartHostNoSync
AppAssembly: /mnt/DEVEL-1T/DOTNET/TerraPlot 0.10.18/KuiperZone.TerraPlot.Demo/bin/Debug/net7.0/KuiperZone.TerraPlot.Demo.dll
GetFreePort
Port: 46035
Process started OK
Connection received
Send scale: 1
Connection OK
RemoteLoader.SendXaml
AssemblyPath: /mnt/DEVEL-1T/DOTNET/TerraPlot 0.10.18/KuiperZone.TerraPlot.Demo/bin/Debug/net7.0/KuiperZone.TerraPlot.Demo.dll
XamlFileProjectPath: /MainWindow.axaml
RemoteLoader.MessageHandler
Message type: StartDesignerSessionMessage
RemoteLoader.MessageHandler
Message type: UpdateXamlResultMessage
UPDATE
Exception:
Error:
RemoteLoader.MessageHandler
Message type: FrameMessage
FRAME: 1, 1 x 1 px, 4 bytes
factory null: False
IsImmediate: False