Fix a crash

app/src/main/java/app/fedilab/android/mastodon/ui/drawer/ComposeAdapter.java

@@ -1647,10 +1647,12 @@ public class ComposeAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder
                         lenght += ("#" + tag + " ").length();
                     }
                     holder.binding.content.setText(statusDraft.text);
+                    if (statusDraft.text.length() - lenght - 3 >= 0) {
                         statusDraft.cursorPosition = statusDraft.text.length() - lenght - 3;
                         statusDraft.setCursorToEnd = false;
                         holder.binding.content.setSelection(statusDraft.text.length() - lenght - 3);
                     }
+                }
             } else if (forwardTag && position > 0 && statusDraft.text != null && statusDraft.text.contains("#") && !statusList.get(position).tagAdded) {
                 Status status = statusList.get(position - 1).reblog == null ? statusList.get(position - 1) : statusList.get(position - 1).reblog;
                 if (status.text == null && status.content != null) {
@@ -1677,11 +1679,13 @@ public class ComposeAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder
                     for (String tag : camelCaseTags) {
                         lenght += ("#" + tag + " ").length();
                     }
+                    if (statusDraft.text.length() - lenght - 3 >= 0) {
                         statusDraft.cursorPosition = statusDraft.text.length() - lenght - 3;
                         statusDraft.setCursorToEnd = false;
                         holder.binding.content.setSelection(statusDraft.text.length() - lenght - 3);
                     }
                 }
+            }
 
             if (statusDraft.spoiler_text != null) {
                 holder.binding.contentSpoiler.setText(statusDraft.spoiler_text);