Cast copied text to string before sending share intent

EditText#getText returns an Editable (editable buffer), not a string.
This is serializable, so it can be put into the intent without error,
but trying to retrieve it with intent.getStringExtra(Intent.EXTRA_TEXT)
returns null. Casting to a string fixes this problem and allows
destination apps to correctly read the copied (and edited) text.

Bug: 227107111
Fix: 227107111
Test: verified that sharing to e.g. Chat copies the text into the
send box (prior to change it would open the app but copy no text).

Change-Id: I3052677ae65556949351e9d112e81d38dc209bc9

packages/SystemUI/src/com/android/systemui/clipboardoverlay/EditTextActivity.java

@@ -95,7 +95,7 @@ public class EditTextActivity extends Activity
     private void share() {
         Intent sendIntent = new Intent();
         sendIntent.setAction(Intent.ACTION_SEND);
-        sendIntent.putExtra(Intent.EXTRA_TEXT, mEditText.getText());
+        sendIntent.putExtra(Intent.EXTRA_TEXT, mEditText.getText().toString());
         sendIntent.setType("text/plain");
 
         Intent shareIntent = Intent.createChooser(sendIntent, null);