macOS "Window Capture" displays last frame of window when closed

[hi-usui]

Platform

Operating system and version: macOS 10.14.6 Mojave OBS Studio version: 26.0.0

Expected Behavior

"Window Capture" should stop displaying when a window is closed in macOS

Current Behavior

"Window Capture" source only shows the last frame before the window was closed

Steps to Reproduce

1. Add a "Window Capture" source
2. Close the window

Additional information

Someone reported this on support forums 2020-06-02 https://obsproject.com/forum/threads/window-capture-staying-on-screen-in-obs-after-closed-window.123690/

Windows 10 OS has the behavior where it stops displaying if window closes. Expecting the same behavior on macOS, please correct if wrong.

[dossy]

It would be nice if after mac-capture detects that the window being captured has disappeared because the application has terminated, it can signal to OBS to hide the input source, so that not only does the displayed content go away, the capture thread can stay asleep and not consume any CPU.