bug#69222: 30.0.50; Toggle password visibility

[Michael Albinus]

`read-passwd' reads a password with hidden input from the
minibuffer. However, passord input fields in other applications but
Emacs allow to toggle the visibility of input while typing the password.

The appended patch tries to implement this for Emacs. While reading the
password, it binds TAB in the minibuffer to a function which toggles the
password visibility.

With graphical displays, it adds also an indicator to the mode line for
password visibility. Clicking this indicator with mouse-1 toggles the
password visibility in the minibuffer.

Comments?

Best regards, Michael.


In GNU Emacs 30.0.50 (build 18, x86_64-pc-linux-gnu, GTK+ Version
 3.24.41, cairo version 1.18.0) of 2024-02-16 built on gandalf
Repository revision: 572d58b5e8d0f1f1244b9ccab8f02c4f50ca8d12
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12302004
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