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.

2 files changed, 12 insertions, 4 deletions

diff --git a/java/org/gnu/emacs/EmacsService.java b/java/org/gnu/emacs/EmacsService.java
index 4e863c750d3..446cd26a3dd 100644
--- a/java/org/gnu/emacs/EmacsService.java
+++ b/java/org/gnu/emacs/EmacsService.java
@@ -114,9 +114,10 @@ public final class EmacsService extends Service
   private ContentResolver resolver;
 
   /* Keep this in synch with androidgui.h.  */
-  public static final int IC_MODE_NULL   = 0;
-  public static final int IC_MODE_ACTION = 1;
-  public static final int IC_MODE_TEXT   = 2;
+  public static final int IC_MODE_NULL     = 0;
+  public static final int IC_MODE_ACTION   = 1;
+  public static final int IC_MODE_TEXT     = 2;
+  public static final int IC_MODE_PASSWORD = 3;
 
   /* Display metrics used by font backends.  */
   public DisplayMetrics metrics;
diff --git a/java/org/gnu/emacs/EmacsView.java b/java/org/gnu/emacs/EmacsView.java
index 8398e4b784c..5b922212c0b 100644
--- a/java/org/gnu/emacs/EmacsView.java
+++ b/java/org/gnu/emacs/EmacsView.java
@@ -838,9 +838,16 @@ public final class EmacsView extends ViewGroup
         EmacsNative.requestSelectionUpdate (window.handle);
       }
 
-    if (mode == EmacsService.IC_MODE_ACTION)
+    if (mode == EmacsService.IC_MODE_ACTION
+        || mode == EmacsService.IC_MODE_PASSWORD)
       info.imeOptions |= EditorInfo.IME_ACTION_DONE;
 
+    if (mode == EmacsService.IC_MODE_PASSWORD)
+      {
+        info.imeOptions |= EditorInfo.IME_FLAG_FORCE_ASCII;
+        info.inputType  |= InputType.TYPE_TEXT_VARIATION_PASSWORD;
+      }
+
     /* Set the initial selection fields.  */
     info.initialSelStart = selection[0];
     info.initialSelEnd = selection[1];