add previous and next buttons to navigate longer queries

[Lazy-poet]

This PR fixes #592

[yannickwurm]

Thanks @Lazy-poet - can we have tests for this as well?

[yannickwurm]

Three additional things:

• it doesn't "know" where it is. If I scroll down to the 10th one, then hit next, it takes me to the 2nd rather than the 11th.
• The "previous" should not be shown if we are at the top of the page. The "next" should not be shown if we've passed the last one. (i.e. not shown - and the | not shown either - rather than simply disabling).
• I think we want a bit more vertical space here too. It looks imbalanced compared to what's happening at Download section of the sidebar.
• Automated test of the transition - when do we have the full index, and when do we show previous/next buttons.
• Automated test of the scrolling behavior (it should know where it is

[Lazy-poet]

Three additional things:

• it doesn't "know" where it is. If I scroll down to the 10th one, then hit next, it takes me to the 2nd rather than the 11th.
• The "previous" should not be shown if we are at the top of the page. The "next" should not be shown if we've passed the last one. (i.e. not shown - and the | not shown either - rather than simply disabling).
• I think we want a bit more vertical space here too. It looks imbalanced compared to what's happening at Download section of the sidebar.
• Automated test of the transition - when do we have the full index, and when do we show previous/next buttons.
• Automated test of the scrolling behavior (it should know where it is

@yannickwurm My most recent commit fixes 1-3 of this comment. Tests for these behaviors are underway and will be updated soonest.

[ghost]

👇 Click on the image for a new way to code review

Legend