Accessibility improvements

[jrosindell]

It has been reported that excessive zooming can trigger migraine and we want to enhance accessibility for the users where this applies. Similarly, free scrolling on pages can be a trigger for the same people and they use page up and page down buttons to avoid it but this does not work on the tabs that open up when clicking on a leaf.

There is some low hanging fruit here....

• [x] Page up and Page down doesn't work on a tab from a leaf because the user needs to click on it first to make the browser focus on the content of that item. This could perhaps be changed so the focus switch is automatic when the user opens the tabs or clicks on a new tab.
• [ ] have an option in the settings to suppress all animations (like the jump feature, but stronger because short distances and clicks still result in zooming over short distances when jump is selected)

[lentinj]

Re: (2), is there really a use-case to expose all 3 of "Fly to [search] results", "Jump to [search] results, fly to signpost-clicks" and "Jump to search and signpost-clicks"? Explaining succinctly what each of the options would do feels hard work.

Life would be simpler for everyone IMO if the existing search jump/fly setting also applied to clicking on signposts, etc.

[lentinj]

Kinda related to the issue in hand. When I click on an image in an interior node, we always leap to the associated leaf node, regardless of anim=zoom. Should we also honour anim here too?

[lentinj]

What I think should be done is:

• Combine all of "leap" / "fly_node" / "tap2zoom" to point at default_move_to()
• Move default_move_to() into controller_anim (from controller_search)
• Relabel the anim settings menu from "search mode" to "navigation" (or something else more common)

...but worth having a chat before actually committing.

[lentinj]

Move on from this; ideally we'd have a box to highlight the later zoomed region so we can follow signposts.

Not worth it for now