Problem: `PackChanged[Pre]` events with `kind=update` are triggered both
during plugin's initial installation and after already installed
plugin was updated.
It was a deliberate decision to allow writing only a single update
hook to act as a dedicated "build" entry point (like execute `make` or
`cargo build —release`). This mimics how other plugin managers have a
single "build" command.
This was a result of 'mini.deps' experience with the different
approach: "update" hooks are not run during install. This proved to be
confusing as it requires to write two hooks. But also the reason might
be that 'mini.deps' names it "checkout" hook instead of "update".
However, the `vim.pack` event approach makes it lower cost to handle
separate "update" and "install" events. Something like
`if ev.data.kind == 'install' or ev.data.kind == 'update' then`
instead of two autocommands.
Plus this makes clearer separation of events.
Solution: do not trigger `PackChanged[Pre] kind=update` event during
install.
16a6559ec6