fix issue #5961 Row header border line of the DataGridView control has very low luminosity contrast ratio

[Epica3055]

Fixes #5961

Proposed changes

• use a different color when RightToLeft is set to Yes

Regression?

• Yes

Screenshots

Before

After

When color applied

When RightToLeft is set to No

Test methodology

• manually

Test environment(s)

• 10.0.0-alpha.1.24455.17

Microsoft Reviewers: Open in CodeFlow

Microsoft Reviewers: Open in CodeFlow

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 75.46505%. Comparing base (49b0091) to head (830bb8f). Report is 94 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #12293         +/-   ##
===================================================
+ Coverage   75.43409%   75.46505%   +0.03096%     
===================================================
  Files           3103        3106          +3     
  Lines         634314      634446        +132     
  Branches       46876       46888         +12     
===================================================
+ Hits          478489      478785        +296     
+ Misses        152401      152228        -173     
- Partials        3424        3433          +9     

Flag	Coverage Δ
Debug	75.46505% <50.00000%> (+0.03096%)	:arrow_up:
integration	17.97985% <0.00000%> (-0.00418%)	:arrow_down:
production	48.87627% <50.00000%> (+0.05753%)	:arrow_up:
test	97.02609% <ø> (+0.00113%)	:arrow_up:
unit	45.91040% <50.00000%> (+0.06000%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

[Tanya-Solyanik]

@Epica3055 - please get this tested

[Tanya-Solyanik]

@Epica3055 - please address issues found by Zheng.