ProcessTests GetWithGui_ShouldRefresh_Windows are flaky

## Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1501127
Build error leg or test failing: System.Diagnostics.Tests.ProcessTests.MainWindowHandle_GetWithGui_ShouldRefresh_Windows
Pull request: N/A

## Error Message

**DO NOT USE JSON BELOW IF THIS IS A BUILD BREAK** otherwise build analysis will allow pull requests to merge that break the build worse. For a build break, do not use this issue form. Make a regular new issue.

Fill the error message using [step by step known issues guidance](https://github.com/dotnet/arcade/blob/main/Documentation/Build%20Analysis/KnownIssueJsonStepByStep.md).

```json
{
"ErrorPattern": "System\\.Diagnostics\\.Tests\\.ProcessTests\\.MainWindow(Handle|Title)_GetWithGui_ShouldRefresh_Windows \\[FAIL\\]",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
```

### Known issue validation
**Build: :mag_right:** https://dev.azure.com/dnceng-public/public/_build/results?buildId=1501127
**Error message validated:** `[System\.Diagnostics\.Tests\.ProcessTests\.MainWindow(Handle|Title)_GetWithGui_ShouldRefresh_Windows \[FAIL\]`]
**Result validation:** :white_check_mark: Known issue matched with the provided build.
**Validation performed at:** 7/14/2026 9:49:32 PM UTC

### Report

|Build|Repository|Test|Pull Request|
|---|---|---|---|
|[1595475](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595475)|dotnet/runtime|[System.Diagnostics.Tests.ProcessTests.MainWindowTitle_GetWithGui_ShouldRefresh_Windows](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595475&view=ms.vss-test-web.build-test-results-tab&runId=44050214&resultId=100095)||
|[1595474](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595474)|dotnet/runtime|[System.Diagnostics.Tests.ProcessTests.MainWindowTitle_GetWithGui_ShouldRefresh_Windows](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595474&view=ms.vss-test-web.build-test-results-tab&runId=44050206&resultId=101654)||
|[1592452](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592452)|dotnet/runtime|[System.Diagnostics.Tests.ProcessTests.MainWindowHandle_GetWithGui_ShouldRefresh_Windows](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592452&view=ms.vss-test-web.build-test-results-tab&runId=43959946&resultId=100208)||
|[1592450](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592450)|dotnet/runtime|[System.Diagnostics.Tests.ProcessTests.MainWindowTitle_GetWithGui_ShouldRefresh_Windows](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592450&view=ms.vss-test-web.build-test-results-tab&runId=43959918&resultId=102178)||
|[1582901](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1582901)|dotnet/runtime|[System.Diagnostics.Tests.ProcessTests.MainWindowTitle_GetWithGui_ShouldRefresh_Windows](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1582901&view=ms.vss-test-web.build-test-results-tab&runId=43669642&resultId=102191)||
|[1582893](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1582893)|dotnet/runtime|[System.Diagnostics.Tests.ProcessTests.MainWindowTitle_GetWithGui_ShouldRefresh_Windows](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1582893&view=ms.vss-test-web.build-test-results-tab&runId=43669606&resultId=100102)||
|[1580613](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1580613)|dotnet/runtime|[System.Diagnostics.Tests.ProcessTests.MainWindowTitle_GetWithGui_ShouldRefresh_Windows](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1580613&view=ms.vss-test-web.build-test-results-tab&runId=43602576&resultId=102097)||
|[1580626](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1580626)|dotnet/runtime|[System.Diagnostics.Tests.ProcessTests.MainWindowTitle_GetWithGui_ShouldRefresh_Windows](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1580626&view=ms.vss-test-web.build-test-results-tab&runId=43602556&resultId=102091)||
|[1562096](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1562096)|dotnet/runtime|[System.Diagnostics.Tests.ProcessTests.MainWindowHandle_GetWithGui_ShouldRefresh_Windows](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1562096&view=ms.vss-test-web.build-test-results-tab&runId=43007206&resultId=102086)||
|[1562097](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1562097)|dotnet/runtime|[System.Diagnostics.Tests.ProcessTests.MainWindowTitle_GetWithGui_ShouldRefresh_Windows](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1562097&view=ms.vss-test-web.build-test-results-tab&runId=43007124&resultId=102094)||
#### Summary
|24-Hour Hit Count|7-Day Hit Count|1-Month Count|
|---|---|---|
|2|4|10|

Start with the failing System.Diagnostics.Tests.ProcessTests.MainWindowHandle_GetWithGui_ShouldRefresh_Windows and MainWindowTitle_GetWithGui_ShouldRefresh_Windows tests, using the linked build results to inspect their failures. Determine why these Windows GUI tests are intermittent, then verify the change by rerunning the affected tests and confirming the repeated build failures no longer occur.

Written by the indexing model from the issue text.