Only include default width if width isn't specified for MemoryViz SVG when calling snapshot

[chiually]

Proposed Changes

Rather than always hard coding the width to 800 in the MemoryViz CLI command, only include the default width if no width is supplied.

Also made it explicit in the docstring of the snapshot function that the default width is 800 but can be changed using memory_viz_args

...

Screenshots of your changes (if applicable)

Type of Change

(Write an X or a brief description next to the type or types that best describe your changes.)

Type	Applies?
🚨 Breaking change (fix or feature that would cause existing functionality to change)
✨ New feature (non-breaking change that adds functionality)
🐛 Bug fix (non-breaking change that fixes an issue)
♻️ Refactoring (internal change to codebase, without changing functionality)	X
🚦 Test update (change that only adds or modifies tests)
📚 Documentation update (change that only updates documentation)
📦 Dependency update (change that updates a dependency)
🔧 Internal (change that only affects developers or continuous integration)

Checklist

(Complete each of the following items for your pull request. Indicate that you have completed an item by changing the [ ] into a [x] in the raw text, or by clicking on the checkbox in the rendered description on GitHub.)

Before opening your pull request:

• I have performed a self-review of my changes.
  • Check that all changed files included in this pull request are intentional changes.
  • Check that all changes are relevant to the purpose of this pull request, as described above.
• I have added tests for my changes, if applicable.
  • This is required for all bug fixes and new features.
• I have updated the project documentation, if applicable.
  • This is required for new features.
• I have updated the project Changelog (this is required for all changes).
• If this is my first contribution, I have added myself to the list of contributors.

After opening your pull request:

• I have verified that the CI tests have passed.
• I have reviewed the test coverage changes reported by Coveralls.
• I have requested a review from a project maintainer.

Questions and Comments

The width of the SVG could always be changed through memory_viz_args since the ordering of the command prioritizes the last specified width. This change ensures the command will only ever include one --width(unless the user explicitly puts multiple in memory_viz_args)

[coveralls]

Coverage Report for CI Build 36217611297

Coverage remained the same at 90.909%

Details

• Coverage remained the same as the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

---

Coverage Stats

Relevant Lines:	4081
Covered Lines:	3710
Line Coverage:	90.91%
Coverage Strength:	17.67 hits per line

---

💛 - Coveralls

[david-yz-liu]

@chiually nice work, I just left one inline comment. Additionally, please update the documentation website (under docs/) to mention this behaviour.

[david-yz-liu]

The overall idea for testing the correct width is good, but using string matching here is fairly brittle.

Instead, please parse the output as xml (see here) and then assert the top-level svg element has the correct value for its width attribute.