Update MainActivity.kt

app/src/main/kotlin/com/simplemobiletools/notes/pro/activities/MainActivity.kt

@@ -142,6 +142,7 @@ class MainActivity : SimpleActivity() {
                 isEnabled = showUndoButton && mCurrentNote.type == NoteType.TYPE_TEXT.value
                 icon.alpha = if (isEnabled) 255 else 127
             }
+
             findItem(R.id.redo).apply {
                 isVisible = areButtonsVisible
                 isEnabled = showRedoButton && mCurrentNote.type == NoteType.TYPE_TEXT.value