LocalNutrientThemeKey

Key that changes when the activity's theme changes in place, such as after Activity.setTheme() in a PdfActivity or an activity hosting a PdfUiFragment. LocalContext and LocalConfiguration stay the same then, so code inside a NutrientTheme that remembers something read from the XML theme keys it on this as well. Colors read from NutrientTheme.colorScheme need no key. 0 outside a NutrientTheme.