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Claude
b7f5f8483a
Saving anything on the Display tab failed with a 400 when double-sided
mode was off:
Double-sided copies (2) must divide chain length (3) evenly
The Display form posts every field in one request, including
double_sided_copies (default 2) and double_sided_axis, whether or not
the Enabled checkbox is ticked. The server block was gated only on "is
any double-sided field present in the payload" — it wrote
ds_config['enabled'] but never read it. A user with chain_length: 3 and
the untouched default copies: 2 was locked out of saving any display
setting at all: brightness, GPIO slowdown, Vegas, sync.
Gate the checks on the enabled flag:
- Divisibility against chain_length/parallel is hardware-relational and
only runs when the feature is on.
- Structural checks (copies parses as an int in 2..8, axis in the
whitelist) still 400 when enabled; when disabled they drop the value
and leave the stored one untouched rather than rejecting the save.
The runtime already gated correctly (_resolve_double_sided returns None
when disabled), so nothing there changes.
Also in the Display tab:
- Hide Copies / Split Axis until Enabled is ticked, mirroring the Vegas
Scroll pattern. Hidden rather than disabled, so the fields keep
submitting and the server still sees an 'off' state to persist.
- Fix the save toast: the form's handler read xhr.responseJSON, a jQuery
property that doesn't exist on a native XMLHttpRequest, so it was
always undefined and every save reported a green "Display settings
saved" — even the 400s. Parse responseText and use the real status.
Tests: two existing double-sided tests asserted 200 on payloads that the
divisibility check (added later, in #373) turns into 400s; the first now
supplies matching hardware values and the second passes as written now
that a disabled save skips the check. Added coverage for the reported
regression, for bad values while disabled, and for the check still
firing when enabled.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016aUvzTXpEYhNEWYQvFqQU9