`macaction terminate:` (also quit via Cmd-q/logout/reboot) ignores `set confirm`

Steps to reproduce

1. Run set confirm
2. Create a few buffers with unsaved changes (doesn't matter if the buffers are backed by files or not).
3. Run command macaction terminate:, or press Cmd-Q, or reboot machine.

Expected behaviour

The setting set confirm should prompt for each unsaved buffer whether you are okay with discarding changes. However, macaction terminate: completely ignores this setting, and just shows a dialog that doesn't mention any file names:

Quit without saving?

There are modified buffers, if you quit now all changes will be lost. Quit anyway?

It appears that macaction terminate: skips a lot of normal Vim exit code as well - autocommands like VimLeavePre do not run.

Version of MacVim

r181

MacVim installation method

GitHub release

Environment

macOS 15.4.1 Sequoia

Logs and stack traces

N/A

Vim and MacVim configuration where issue is reproducable

Doesn't appear to depend on config. I tested both with mvim --clean and my usual config, https://github.com/telotortium/vimrc

How was MacVim launched?

• by launching MacVim.app in macOS (by using the Dock, Spotlight, or the open command)
• by running mvim/gvim in the terminal

Issue has been tested with clean configuration

• by running mvim --clean (or gvim, supplied by MacVim distribution). You can also use the File → "New Clean Window" menu item within MacVim.
• by running vim --clean (in terminal, supplied by MacVim distribution)
• by running vim --clean (in terminal, other suppliers, e.g. /usr/bin/vim)

Start from the macaction terminate: handling and compare it with the normal Vim exit path, using the reported Cmd-Q and logout/reboot paths as reproduction cases. Reproduce with mvim --clean, set confirm, and unsaved buffers; done when each buffer is confirmed and VimLeavePre runs during termination.