Merge "Register IME back callback in doStartInput" into main

                mInlineSuggestionSessionController.notifyOnStartInputView();

                onStartInputView(mInputEditorInfo, restarting);

                startExtractingText(true);

                // Back callback is typically registered in {@link #showWindow()}, but it's possible

                // for {@link #doStartInput()} to be called without {@link #showWindow()} so we also

                // register here.

                registerDefaultOnBackInvokedCallback();

            } else if (mCandidatesVisibility == View.VISIBLE) {

                if (DEBUG) Log.v(TAG, "CALL: onStartCandidatesView");

                mCandidatesViewStarted = true;