Closes FR-44
Unlike X11, where Zed already times out clipboard reads, on Wayland we
had no timeout at all. We read the clipboard from a pipe the source app
writes into, and we were doing a blocking `read_to_end` on it. So if the
other app opened the pipe but never wrote anything, or stalled partway
through, the read would block forever and hang Zed.
This PR replaces it with a non-blocking read driven by `poll` with a 4s
timeout, so:
- a stalled writer fails cleanly instead of freezing us.
- a slow writer that's still making progress on a large payload keeps
working.
This roughly mirrors what the X11 path already does. I have tested
pasting text, large image, drag-n-drop, etc cases.
To Reproduce:
1. Copy text from a web page in Firefox.
2. `kill -STOP "$(pgrep -o firefox)"`
3. Paste into Zed.
Zed hangs indefinitely.
<img width="400"
src="https://github.com/user-attachments/assets/532d1c55-1500-4143-8227-127e0024efba"
/>
Release Notes:
- Fixed a freeze on Linux Wayland when reading the clipboard from a slow
or unresponsive application.
Smit Barmase
53367edf64