custom overlay: Highlight missing data filter

[rusty-snake]

trafficstars

Use case

• Show (colored) existing values on all elements selected for the overlay
  • e.g. select:ways with highway color:surface
• Show data as missing for !access or access ~ yes do not report as missing for access ~ private|no.
• Tap (open/edit) all elements selected for the overlay

Currently you have to either use ways with highway and access !~ private|no where you can not see existing values nor edit it anyway or have a lot of unfixable missing data.

Proposed Solution

1. Replace the boolean toggle for missing data with a positive or negative filter, e.g. Highlight missing data filter: access !~ private|no
2. Replace the boolean toggle with a three state toggle No | Public | Yes