[MaterialCalendar] Color surface not being applied properly

[jgavazzisp]

Description: Full description of the issue here
When a custom theme for the DatePicker is used, "colorSurface" is ignored despite the fact of "colorPrimary", "colorOnPrimary" and "colorOnSurface" working properly.

Expected behaviour: Screenshots and/or description of expected behaviour
Attribute "colorSurface" from overwritten DatePicker theme should be used instead of the main theme "colorSurface".

Source code:

Android API version: 29

Material Library version: 1.2.0-alpha02

Device: Pixel 3 XL

[dsn5ft]

Thanks for reporting this issue. My guess is that this is because we're calling getContext() again to read the colorSurface attribute, instead of using the Dialog's context which is wrapped using the DatePicker theme:

https://github.com/material-components/material-components-android/blob/master/lib/java/com/google/android/material/datepicker/MaterialDatePicker.java#L167

I'll verify that that's the issue and submit a fix soon.