BaseInput: Validation should not run on blur when ReadOnly = true.

[Mr-Technician]

Description

Previously, a readonly field would still run validation on blur. This PR prevents this behavior:

https://try.mudblazor.com/snippet/wacnYnQdporidlIP

How Has This Been Tested?

Unit

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.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (1deeac0) 91.16% compared to head (9cf7b5c) 91.17%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #6518      +/-   ##
==========================================
+ Coverage   91.16%   91.17%   +0.01%     
==========================================
  Files         388      392       +4     
  Lines       14790    14836      +46     
==========================================
+ Hits        13483    13527      +44     
- Misses       1307     1309       +2     

Impacted Files	Coverage Δ
src/MudBlazor/Base/MudBaseInput.cs	92.15% <100.00%> (+0.15%)	⬆️

... and 30 files with indirect coverage changes

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[henon]

Makes sense. What about Disabled?

[Mr-Technician]

Makes sense. What about Disabled?

I'll double-check but I don't believe it's possible to trigger onblur when an input is disabled. That's the big difference between ReadOnly and Disabled.

See: https://try.mudblazor.com/snippet/ckGHEHmdpMLiJPgs