Fix IME down caret in keyguard nav bar bug.

The input method manager service now keeps track of whether or not
the ime was shown on the keyguard.  This prevents activities behind
the keyguard from incorrectly showing the down-caret in the keyguard.

Bug:7498792
Change-Id: I0de01ec29cb544e902305b0f9d9fb94a73835e7b

Author: John Spurlock

services/java/com/android/server/InputMethodManagerService.java

@@ -386,6 +386,7 @@ public String toString() {
     private Locale mLastSystemLocale;
     private final MyPackageMonitor mMyPackageMonitor = new MyPackageMonitor();
     private final IPackageManager mIPackageManager;
+    private boolean mInputBoundToKeyguard;
 
     class SettingsObserver extends ContentObserver {
         SettingsObserver(Handler handler) {
@@ -877,10 +878,12 @@ private void refreshImeWindowVisibilityLocked() {
         final boolean hardKeyShown = haveHardKeyboard
                 && conf.hardKeyboardHidden
                         != Configuration.HARDKEYBOARDHIDDEN_YES;
-        final boolean isScreenLocked = mKeyguardManager != null
-                && mKeyguardManager.isKeyguardLocked()
-                && mKeyguardManager.isKeyguardSecure();
-        mImeWindowVis = (!isScreenLocked && (mInputShown || hardKeyShown)) ?
+        final boolean isScreenLocked =
+                mKeyguardManager != null && mKeyguardManager.isKeyguardLocked();
+        final boolean isScreenSecurelyLocked =
+                isScreenLocked && mKeyguardManager.isKeyguardSecure();
+        final boolean inputShown = mInputShown && (!isScreenLocked || mInputBoundToKeyguard);
+        mImeWindowVis = (!isScreenSecurelyLocked && (inputShown || hardKeyShown)) ?
                 (InputMethodService.IME_ACTIVE | InputMethodService.IME_VISIBLE) : 0;
         updateImeWindowStatusLocked();
     }
@@ -1124,6 +1127,13 @@ InputBindResult startInputUncheckedLocked(ClientState cs,
             return mNoBinding;
         }
 
+        if (mCurClient == null) {
+            mInputBoundToKeyguard = mKeyguardManager != null && mKeyguardManager.isKeyguardLocked();
+            if (DEBUG) {
+                Slog.v(TAG, "New bind. keyguard = " +  mInputBoundToKeyguard);
+            }
+        }
+
         if (mCurClient != cs) {
             // If the client is changing, we need to switch over to the new
             // one.