fixed repeated key presses when a modifier key is held

[Rishab87]

Resolves #7282

Changes:
As @davepagurek proposed above, I have used .repeat check to make sure we can capture repeated presses and recording which keys were pressed in combination with the meta key, and then when the meta key is released, manually update _downkeys so that they're all set to false

Screenshots of the change:

PR Checklist

• npm run lint passes
• Inline documentation is included / updated
• Unit tests are included / updated

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[davepagurek]

I think these changes look good to merge, thank you @Rishab87!

Next time, we ask that you wait to be assigned to an issue before filing a PR, as for this one someone else had been assigned. Our contributor docs mention:

You should not "jump the queue" by filing a PR for an issue that either someone else has indicated willingness to submit a contribution or has already been assigned to someone else.

[Rishab87]

time, we ask that you wait to be assigned to an issue before filing a PR, as for this one someone else had been assigned.

@davepagurek sure thing! I'll keep that in mind from next time!