MessageBox: Add "mud-message-box" class

[danielchalmers]

Description

Adds a class to MudMessageBox so you can apply styles to it and its children.

How Has This Been Tested?

none

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[danielchalmers]

Replaces #7807 because I broke the branch

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ee80e01) 88.25% compared to head (0d32455) 88.24%.
Report is 3 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #8189      +/-   ##
==========================================
- Coverage   88.25%   88.24%   -0.01%     
==========================================
  Files         394      394              
  Lines       11742    11753      +11     
  Branches     2377     2380       +3     
==========================================
+ Hits        10363    10372       +9     
- Misses        854      855       +1     
- Partials      525      526       +1     

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[ScarletKuro]

Just visually from another project. Unsure what tests would be added.

The test would be basically to test if the specified class is applied in the html, a really simple test.

[danielchalmers]

Just visually from another project. Unsure what tests would be added.

The test would be basically to test if the specified class is applied in the html, a really simple test.

@ScarletKuro

That makes sense! Are the tests I just updated appropriate?

[henon]

Thanks!