Add IMM#invalidateInput()

Historically TextView#setText() has internally called

  InputMethodManager#restartInput(View)

simply because the text seen from the IME is going to be out-of-sync.

Although this behavior is semantically helpful for IMEs, especially
after the initial surrounding text information became available in
EditorInfo, issuing a sync IPC from the calling thread (UI thread
actually) is not plausible from the performance perspective.

This CL fills this gap by adding a new API

  InputMethodManager#invalidateInput(View)

for the scenario where apps independently modify the text with keeping
other text metadata such as input-type to be the same.

All the observable behaviors from the IME remain to be the same as

  InputMethodManager#restartInput(View).

For instance, any pending tasks that are already issued with

  InputMethodService#getCurrentInputConnection()

will be effectively cancelled by using a recently added mechanism [1].

 [1]: I383c3958d2ac1a8d217706509fa12a92b381bbb3

Fix: 203086369
Test: atest -c CtsInputMethodTestCases:InputMethodStartInputLifecycleTest
Change-Id: I3161755779080f98bcef0e47dd0c5247d8a3a256

1 files changed, 11 insertions, 0 deletions

diff --git a/core/java/android/inputmethodservice/RemoteInputConnection.java b/core/java/android/inputmethodservice/RemoteInputConnection.java
index ed617afab96e..9ef2579d04e2 100644
--- a/core/java/android/inputmethodservice/RemoteInputConnection.java
+++ b/core/java/android/inputmethodservice/RemoteInputConnection.java
@@ -103,6 +103,17 @@ final class RemoteInputConnection implements InputConnection {
         mCancellationGroup = cancellationGroup;
     }
 
+    @AnyThread
+    public boolean isSameConnection(@NonNull IInputContext inputContext) {
+        return mInvoker.isSameConnection(inputContext);
+    }
+
+    RemoteInputConnection(@NonNull RemoteInputConnection original, int sessionId) {
+        mImsInternal = original.mImsInternal;
+        mInvoker = original.mInvoker.cloneWithSessionId(sessionId);
+        mCancellationGroup = original.mCancellationGroup;
+    }
+
     /**
      * See {@link InputConnection#getTextAfterCursor(int, int)}.
      */