Keep existing selection after reindexing

[winstliu]

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions

Description of the Change

After a reindex completes, all the items in the select list get regenerated. If someone had a file selected, the refresh would cause the selection to jump back to the first element. This PR fixes that by manually re-selecting the previous file after the reindex completes.

Alternate Designs

I hope there's an alternate design; this one didn't come out that pretty.

Benefits

Selection will not unexpectedly change after a reindex completes.

Possible Drawbacks

The for loop I added creates some delay, especially for larger projects since it loops through every single file.

Applicable Issues

Fixes #210

/cc @Ben3eeE

[Ben3eeE]

@50Wliu Thanks for opening this ⚡️ LGTM. I couldn't notice any delay even with a larger project and slow computer where I noticed the issue this fixes!

🚢 if you are fine with the drawback!

[nfarina]

This issue has been driving me crazy - would love to have this fixed! Any reason it can't be merged? Seems like a slam dunk—straightforward code and small scope of changes.

[winstliu]

Forgot about this PR. Let me revisit it in the next few days and see if I can remember my logic here.