feat: optionally disable popping on backspace

[r-zane-spalding]

What does it do?

Adds disablePoppingOnBackspace prop to allow for optionally disabling the popping of nodes from the tree when the 'backspace' key is pressed in an empty search bar.

Fixes #550

Please mention in the format "Fixes #issueNumber" or "Closes #issueNumber".
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Type of change

Please delete options that are not relevant.

• [x ] New feature (non-breaking change which adds functionality)
• [ x] This change requires a documentation update

Checklist:

• [ x] I have performed a self-review of my own code
• [ x] I have commented my code, particularly in hard-to-understand areas
• [ x] Updated documentation (if applicable)
• [ x] Added tests that prove my fix is effective or that my feature works
• [ x] New and existing unit tests pass locally with my changes
• [ x] My changes generate no new warnings

[mrchief]

Curious, why the double test?

[r-zane-spalding]

Good point, was following the pattern of the previous test but isn't really needed. Want me to change it on the branch and make a new PR?

[mrchief]

If there's no real purpose, then let's get rid of it. You should be able to push the updates on your branch and this PR should reflect those changes.

[mrchief]

IOW, you don't have to create a new branch or PR everytime you make an edit

[r-zane-spalding]

Gotcha, change made.

[codeclimate]

Code Climate has analyzed commit 4098fc9 and detected 0 issues on this pull request.

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[mrchief]

@allcontributors[bot] Let's add @moonjy1993 for code

[allcontributors]

@mrchief

@moonjy1993 already contributed before to code

[mrchief]

@allcontributors Let's add @r-zane-spalding for code

[allcontributors]

@mrchief

I've put up a pull request to add @r-zane-spalding! 🎉

[github-actions]

🎉 This PR is included in version 2.7.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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