Allow both sidebars on one side.

[RokeJulianLockhart]

#108264 (comment):

[gjsjohnmurray]

Previously requested in #142742 by @heartacker at a time when the secondary side bar was called the side panel, but that issue was ultimately closed by @sbatten as out of scope.

[RokeJulianLockhart]

In which case, @gjsjohnmurray, I'd like to close this as a duplicate, but I'd also like the (other) issue to be re-triaged.

[vscodenpa]

Thanks for creating this issue! We figured it's covering the same as another one we already have. Thus, we closed this one as a duplicate. You can search for similar existing issues. See also our issue reporting guidelines.

Happy Coding!