Add UI to toggle toolbar items

[quincylvania]

The v3 contextual toolbar opens up lots of possibilities for operation discoverability and advanced tools in iD (see #6684 (comment)). However, it runs the risk of becoming cluttered.

If a mapper never uses a tool like Circularize—or relies solely on the keyboard shortcut—it's a waste to always show the button.

We should add a way for users to quickly add and remove items from the toolbar. Logically, this could be a toolbar item itself.

This would let us keep the default toolbar stripped down while still offering tools for power mappers. For example:

• Extract cycleway or sidewalk (Extract Option for Cycleways and Sidewalks from ways #6541)
• Query features at low zoom (Make large features selectable at low zoom #6662)
• Follow a path (Follow a path #1614)

In addition, features that live elsewhere could have be turned into optional, redundant tools. These could replace the need to dive into menus or use keyboard shortcuts for some users.

• Switch backgrounds
• Adjust imagery offset
• Toggle minimap, streetview, info panels, etc.
• Navigate issues

As part of #6483, these toolbar items could be modular so developers could create and distribute their own tool plugins.

[slhh]

@quincylvania
In general we should avoid to let user customizations change the functionality of iD essentially for the following reasons:

• It makes supporting other users harder. Mapping instruction in discussions or manuals would potentially fail for the other user due to different customization.
• Requiring knowledge how to customize iD to support your mapping task well is contradictory to beina an easy to use editor.

Making operations unavailable is such an essential change of the functionality. Fortunately, your concept can be modified:

Make operations removeable from the top bar like removing favorites.
In case operations were removed, show the tools button, which is opening a dropdown making removed operations directly available. Items of the dropdown can be made dragable back to the topbar. The Tools button could also be named "More".
The customization does only decide whether invoking an operation requires pressing one or two buttons, which isn't an essential change anymore.

Another benefit is, that the tools button doesn't contribute to cluttering the topbar for any context where hiding some operations isn't desirable.

Operations in the tools dropdown can be checked for availablity when the tools button is pressed. This could potentially improve the general performance of iD.

[quincylvania]

@slhh I appreciate and share your desire to keep iD an easy-to-use editor. However, I don't think this feature would detract from that goal.

This menu would be a compromise between not supporting advanced features and showing an overwhelming number of controls. Avoiding scope creep like this was part of the reasoning behind the taskbar concept (#3123), which the rich toolbar is somewhat growing to encompass. All the basic tools the user needs would appear by default, just as they do now, and the rest would be just a few clicks away.

Mapping instruction in discussions or manuals would potentially fail for the other user due to different customization.

True, but I don't think it's a big issue to say things like "make sure the Extract tool is enabled" in guides.

Requiring knowledge how to customize iD to support your mapping task well is contradictory to beina an easy to use editor.

To me, an easy-to-use editor doesn't imply that every task must be equally easy nor that no learning is required. It means the learning curve is so shallow that the user feels like the app is working for them, not against them.

Making operations unavailable is such an essential change of the functionality.

The user would still be in control of what tools are enabled. And in any case iD v3 is intended to change essential functionality where needed.

[quincylvania]

I added this starting in ead729b. It'd be great for people to start using it and tell us what they think. It'll become more useful as we add more optional tools.