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Dave Rayment 8d0f8e5b49 [ZoomIt] Add datetime suffix to screenshots (#43172 )

This pull request introduces an improvement to how screenshot filenames
are generated in `ZoomIt`. The main change is to ensure that each
screenshot is saved with a unique, timestamped filename, which helps
prevent accidental overwrites and keeps files sorted chronologically.

**Enhancement to screenshot filename generation:**

* Added a new implementation for `GetUniqueScreenshotFilename()` in
`Zoomit.cpp` to generate screenshot filenames using the current date and
time, following the format `"ZoomIt YYYY-MM-DD HHMMSS.png"`. This
reduces the risk of overwriting existing files and improves file
organization.<!-- Enter a brief description/summary of your PR here.
What does it fix/what does it change/how was it tested (even manually,
if necessary)? -->
## Summary of the Pull Request
This PR:

Includes an update to create unique screenshot filenames, saving the
user from having to manually type a new filename each time they save a
new screenshot in the same location.

<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist

- [x] Closes: #43158
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

<!-- Provide a more detailed description of the PR, other things fixed,
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

## Unique filename issue

The PR fixes the user's complaint about the screenshots always being
called "zoomit" by adding a `GetUniqueScreenshotFilename()` method which
creates a unique filename based on the current date and time, e.g.
`ZoomIt 2025-11-01 004723.png`. This is consistent with other tools like
the Windows Snipping Tool and provides files which sort correctly when
ordered by name, which is not the case for files with simple numeric
suffixes.

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

Tested on a local build.

2026-02-24 12:53:22 +08:00