Added confirmation for edit original

app/src/main/java/eu/faircode/email/FragmentCompose.java

@@ -1458,6 +1458,22 @@ public class FragmentCompose extends FragmentBase {
             }
 
             private void convertRef(boolean plain) {
+                if (plain)
+                    _convertRef(plain);
+                else
+                    new AlertDialog.Builder(getContext())
+                            .setMessage(R.string.title_ask_show_html)
+                            .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                                @Override
+                                public void onClick(DialogInterface dialog, int which) {
+                                    _convertRef(false);
+                                }
+                            })
+                            .setNegativeButton(android.R.string.cancel, null)
+                            .show();
+            }
+
+            private void _convertRef(boolean plain) {
                 etBody.clearComposingText();
 
                 Bundle args = new Bundle();