## Summary of the Pull Request
Fixes#4247. Improves consistency in -pos tag parsing by supporting
single-value input for both axes.
## References and Relevant Issues
#4247
## Detailed Description of the Pull Request / Additional comments
The change aligns -pos behavior with padding-style logic. Existing
comma-separated behavior remains unchanged.
- A single value like "number" now sets both x and y positions to that
value — similar to how padding behaves.
- A value like "number," (with a trailing comma) continues to set only
x, leaving y unchanged.
## Validation Steps Performed
- Ran all unit and integration tests
- Added unit test to verify single-value and comma-separated inputs
## PR Checklist
- [x] Closes#4247
- [x] Tests added/passed
- [x] Documentation updated
https://github.com/MicrosoftDocs/terminal/pull/890
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Co-authored-by: Carlos Zamora <cazamor@microsoft.com>
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