fix #13624 DemoConsole app: An exception pops up when focusing on "Type Here" in contextMenuStrip under DarkMode

[Epica3055]

Fix #13624

Root cause

When in DarkMode we use ToolStripSystemDarkModeRenderer do the rendering work.

Type here is not an actual ToolStripItem, so the null value pass to ToolStripArrowRenderEventArgs

So not only in DarkMode, but also in normal color mode, e.Item in DrawArrow is null, but the DrawArrow method of ToolStripRenderer makes a null judgment on e.Item, while ToolStripRenderer.cs does not, so this problem occurs.

Proposed changes

• Add null check like we did here

Before

Exception.mp4

After

no Exception

Test methodology

• manual test

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.60341%. Comparing base (08485db) to head (753da08).
Report is 8 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #13635         +/-   ##
===================================================
- Coverage   76.60828%   76.60341%   -0.00487%     
===================================================
  Files           3253        3253                 
  Lines         640996      640995          -1     
  Branches       47439       47439                 
===================================================
- Hits          491056      491024         -32     
- Misses        146290      146321         +31     
  Partials        3650        3650                 

Flag	Coverage Δ
Debug	76.60341% <0.00000%> (-0.00487%)	⬇️
integration	18.98972% <0.00000%> (-0.00413%)	⬇️
production	51.05805% <0.00000%> (-0.01096%)	⬇️
test	97.41175% <ø> (ø)
unit	48.43629% <0.00000%> (-0.01061%)	⬇️

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[LeafShi1]

Please add Root Cause in the description