Prevent passwords from being recorded during text conversion

* doc/lispref/commands.texi (Misc Events): Document new value of
text-conversion-style.

* java/org/gnu/emacs/EmacsService.java (EmacsService)
<IC_MODE_PASSWORD>: New constant.

* java/org/gnu/emacs/EmacsView.java (onCreateInputConnection):
Set TYPE_TEXT_VARIATION_PASSWORD and IME_FLAG_FORCE_ASII if mode
is IC_MODE_PASSWORD.

* lisp/subr.el (read-passwd): Set text-conversion-style to
`password'.

* src/androidgui.h (enum android_ic_mode): New value
ANDROID_IC_MODE_PASSWORD.

* src/androidterm.c (android_reset_conversion): Handle
`password'.

* src/buffer.c (syms_of_buffer)
<&BVAR (current_buffer, text_conversion_style)>: Update doc
string.

* src/textconv.c (syms_of_textconv) <Qpassword>: New DEFSYM.
<Vtext_conversion_edits>: Fix typos in doc string.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/buffer.c b/src/buffer.c
index 07d19dfc078..9f954e1aba9 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -5900,12 +5900,19 @@ Use Custom to set this variable and update the display.  */);
                                                      text_conversion_style),
                      Qnil,
     doc: /* How the on screen keyboard's input method should insert in this buffer.
+
 When nil, the input method will be disabled and an ordinary keyboard
 will be displayed in its place.
+
 When the symbol `action', the input method will insert text directly, but
 will send `return' key events instead of inserting new line characters.
 Any other value means that the input method will insert text directly.
 
+When the symbol `password', an input method capable of ASCII input will
+be enabled, and will not save entered text where it will be retrieved
+for text suggestions or other features not suited to handling sensitive
+information, in addition to reporting `return' as when `action'.
+
 If you need to make non-buffer local changes to this variable, use
 `overriding-text-conversion-style', which see.