When sending reload(...) + preview(...) during the same event, the preview is reset

[noahmayr]

Checklist

• I have read through the manual page (man fzf)
• I have searched through the existing issues
• For bug reports, I have checked if the bug is reproducible in the latest version of fzf

Output of fzf --version

0.49.0 (brew)

OS

• Linux
• macOS
• Windows
• Etc.

Shell

• bash
• zsh
• fish

Problem / Steps to reproduce

Reproduction:

1. Run the following example

SHELL=/bin/sh LIST="a\nb\nc" fzf --preview 'echo {}'  --bind 'start:reload(echo $LIST)' --bind 'ctrl-p:reload(echo $LIST)+preview(echo "Hello World")

2. Press ctrl-p to switch to a temporary preview showing "Hello World"

Expected:
The list is reloaded and the preview shows "Hello World" and goes back to the configured preview when navigating through the list

Actual:
The list is reloaded, the preview quickly flashes "Hello World" before showing the preview configured by --preview

[junegunn]

Both reload and preview actions run asynchronously, so there is no guarantee that they finish in the specified order.

To give a better example:

echo alice | fzf --preview 'echo Hello {}' --bind 'space:reload(sleep 1; echo bob)+preview(echo Hi {})'

I'm not sure what you're trying to achieve with the actions, but it looks like you need a different strategy.