I would like to change up button icon in ActionBar that is working with Navigation Component. I've tried several options like:

```
supportActionBar?.setHomeAsUpIndicator(R.drawable.ic_arrow_left_blue_24dp)

```

in `MainAcitivty` or 

```
app:navigationIcon="@drawable/ic_arrow_left_blue_24dp"

```

in `Toolbar` .xml file and nothing seems to work.

I have a pretty standard setup with 

```
setSupportActionBar(appToolbar.toolbar)
setupActionBarWithNavController(this, navController)

```

called in `MainActivity:onCreate` method.

I would expect that 

```
supportActionBar?.setHomeAsUpIndicator(R.drawable.ic_arrow_left_blue_24dp)

```

would work, because for example disabling title for `ActionBar` by calling:

```
supportActionBar?.setDisplayShowTitleEnabled(false)

```

works as expected and title is not set to `Fragment` name while navigating. 

What's more, I investigated a little bit and in `ActionBarOnDestinationChangedListener` there is a call to `setNavigationIcon` which is setting an icon to `DrawerArrowDrawable`, which is a little bit weird since I'm not using `Drawer` in my setup. 

Also changing to:

```
setupWithNavController(toolbar, navController)

```

is not working because `ToolbarOnDestinationChangedListener` also using the same `DrawerArrowDrawable`.