feat: Give more detail on key with missing id (KM02099)

[DavidLRowe]

Is your feature request related to a problem? Please describe.

I was moving a longpress key and cut (rather than copied) the id field from the existing location to the new longpress key, then neglected to delete the old longpress key. When I tried compiling I got:

manga_ajami.kmn - info KM05002: Building manga_ajami.kmn
manga_ajami.kmn - warn KM02099: A key on layer "default" has no identifier.
manga_ajami.kmn - info KM05010: The build failed because option "treat warnings as errors" is enabled and there are one or more warnings.
manga_ajami.kmn - info KM05007: manga_ajami.kmn failed to build.

I switched to "Code" view to see if I could identify the problem. When I tried to switch back to "Design" view I got:
manga_ajami.keyman-touch-layout - error KM04000: Exception ETouchLayoutValidate reading JSON data: Validation failure: Member id is required
I eventually found the problem by deleting information from the .keyman-touch-layout file until Developer would load the file.

Describe the solution you'd like

It'd be super nice if that warning could tell me what row number had the problem and even count the key items on the row!

Could the IDE give some visual indication (red border or background on the ID field, perhaps?) when the ID is missing or invalid? That might be annoying in practice, though.

Comment from @mcdurdin:
Unfortunately, the JSON parser and validator doesn't give us much detail (an XPath would be nice!)

Describe alternatives you've considered

Manual search through the .keyman-touch-layout file. (But I didn't find it when I tried this and had to resort to deleting layers, rows and keys until Developer loaded the file.)

If the JSON were always written out with the "id" first, followed by the "text", it might have been easier to spot. I know it's a dictionary/map and order doesn't matter, but a consistent order of keys does make a visual comparison easier.

Related issues

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Keyman apps

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Keyman version

17.0.330

Operating system

Windows 11

Device

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Target application

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