Moving windows in the client application doesn't work properly when using Sample Dual UI in mirror mode.

[arnaud-jamin]

Describe the bug
When trying to move a window in the client application when using Sample Dual UI in mirror mode, the window teleport to a fixed location.

To Reproduce

1. Launch the sample in SampleDualUI
2. launch the server
3. connect to the server
4. Choose Mirror UI
5. Move a window on the server: it works
6. Move a window on the client: it gets teleported

Expected behavior
The window on the client should not teleport to a fixed location, but should follow the mouse

Screenshots

Additional context
This is because the last mouse pos received on the client is given to imgui on a new frame, even if this mouse position is not relevant anymore:

io.AddMousePosEvent(pCmdInput->mMousePos[0], pCmdInput->mMousePos[1]);

Callstack:

ProcessInputData
NewFrame

[sammyfreg]

On mirror mode, the client input/display properties (size/dpi) are completly ignored, it only shows the content controlled by the server and sent to it. I did notice the window jump once, which I will investigate, but you should not expect to be able to move/control content on the client in this particular mode. This mode is not that useful, just a showcasing that it is possible to see locally what's being rendered on the server.

[arnaud-jamin]

Ok thanks!

Very nice work by the way.