Fix last character of password field being visible after rotation

This is a fix for http://code.google.com/p/android/issues/detail?id=907. Note that
that issue was declined without comment, but the bug (while incredibly minor)
does exist. This can be seen on the facebook app, as well as many third party apps.

Change-Id: I8f1449c47228f5f757a5baf389656e51c817b150

Author: Devin Taylor

core/java/android/text/method/PasswordTransformationMethod.java

@@ -51,6 +51,8 @@ public CharSequence getTransformation(CharSequence source, View view) {
                 sp.removeSpan(vr[i]);
             }
 
+            removeVisibleSpans(sp);
+
             sp.setSpan(new ViewReference(view), 0, 0,
                        Spannable.SPAN_POINT_POINT);
         }
@@ -100,10 +102,7 @@ public void onTextChanged(CharSequence s, int start,
             int pref = TextKeyListener.getInstance().getPrefs(v.getContext());
             if ((pref & TextKeyListener.SHOW_PASSWORD) != 0) {
                 if (count > 0) {
-                    Visible[] old = sp.getSpans(0, sp.length(), Visible.class);
-                    for (int i = 0; i < old.length; i++) {
-                        sp.removeSpan(old[i]);
-                    }
+                    removeVisibleSpans(sp);
 
                     if (count == 1) {
                         sp.setSpan(new Visible(sp, this), start, start + count,
@@ -125,14 +124,18 @@ public void onFocusChanged(View view, CharSequence sourceText,
             if (sourceText instanceof Spannable) {
                 Spannable sp = (Spannable) sourceText;
 
-                Visible[] old = sp.getSpans(0, sp.length(), Visible.class);
-                for (int i = 0; i < old.length; i++) {
-                    sp.removeSpan(old[i]);
-                }
+                removeVisibleSpans(sp);
             }
         }
     }
 
+    private static void removeVisibleSpans(Spannable sp) {
+        Visible[] old = sp.getSpans(0, sp.length(), Visible.class);
+        for (int i = 0; i < old.length; i++) {
+            sp.removeSpan(old[i]);
+        }
+    }
+
     private static class PasswordCharSequence
     implements CharSequence, GetChars
     {