[FLUF] Can't tab out after going Windowed Mode

[Chronicron]

Type: FLUF
Bug: The game is keeping me hostage when attempting to Alt+Tab after enabling Windowed Mode

Reproduction Steps:

• Set the Render Mode to DX9
  
• Enable Borderless Window in FLUF
  
• Press Alt+Enter
  
• Press Alt+Tab
  
• See the game tab you back in without your input
  

Additional info: Disabling Borderless Window does nothing, the game still treats it as being Borderless. Pressing Alt+Enter again does not bring the game back into a Fullscreen Mode either. Not only that, but when trying to open FLUF menu after using Alt+Enter, it causes the following error:

Code:

    Unhandled Exception!
    -- Important Information --
    Source: d3d9.dll
    RelExpAddr: 0x05feeb
    ExpCode: 0xc0000005
    ExpFlags: 0
    ExpAddress: 0x5f6cfeeb

I can't show it on the video, but I have a double monitor setup, and tabbing out of the game snaps my mouse back into Freelancer when it shows up again. Clicking anywhere on my second screen also snaps the mouse back in and prevents me from doing literally anything on my second monitor when the game is in windowed mode.



EDIT: This is only present in DirectX 9 Render Mode.
Side Note: Do NOT enable Vilkan. Ii will wreck everything.