Askpass is not always used for asking for a passphrase

[X-dark]

This hardcoded string is misleading:

lxqt-openssh-askpass/src/mainwindow.ui

Line 20 in c0c34b6

<string>Enter your SSH passphrase for request:</string>

In my workflow, askpass is triggered for a lot of things like asking for security key pin, for confirming host key,...

Usually, the message provided by ssh is sufficient. I think, this string can just be removed.

[adrelanos]

I am also looking for kinda a --hide-default-prompt option.

[Vladimir-csp]

Classic X11 ssh-askpass just takes prompt text strictly from a lonely $1. Single argument replaces default prompt. Single empty argument means no text. More than one argument means default text.

gnome-ssh-askpass takes prompt text from all arguments concatenated via spaces (this is not supported by classic ssh-askpass, so I would not recommend mimicking it). But given prompt also fully replaces default prompt.

gnome-ssh-askpass also has this:

SSH_ASKPASS_PROMPT
If set to confirm, show a yes-or-no prompt, defaulting to yes. If set to none,
show a prompt with only a close button. Otherwise, show an OK-or-cancel prompt,
defaulting to OK. This environment variable is typically set by ssh-add(1), and
should not normally be set manually.

And this feature is actually used by ssh-add, so one might consider it canon.