All three UI variants stripped the displayed version at the FIRST
dash, assuming it was always the commit-hash separator build.sh
appends. A tag containing its own dash (e.g. v1.21-rc1) has that
dash earlier, so the splash screen silently dropped "-rc1" and
showed just "v1.21" — no way to tell an RC from the final release
on-device.
Strip at the LAST dash instead, since build.sh always appends the
commit hash as the final segment regardless of how many dashes the
tag itself has.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
AUTO_OFF_MILLIS is a power-save feature aimed at battery use. When the
board reports isExternalPowered() == true (USB or other DC source),
blanking the screen serves no purpose — there's nothing to conserve.
But OLEDs are vulnerable to burn-in with static content, so this
behaviour is gated behind a new build flag KEEP_DISPLAY_ON_USB. Default
is unchanged from upstream — the display blanks after AUTO_OFF_MILLIS
on USB or battery. Variants that ship with an LCD instead of an OLED
(e.g. heltec_t096) can opt in by adding -D KEEP_DISPLAY_ON_USB to
their env, gaining always-on-while-powered without exposing OLED users
to burn-in risk.
When the flag is enabled, the implementation refreshes _auto_off every
loop iteration while externally powered, so the timer naturally counts
a fresh AUTO_OFF_MILLIS window from the moment power is removed —
no instantaneous-blank-on-unplug.
Applied to all three companion_radio UI flavours (ui-new, ui-tiny,
ui-orig). Boards without an isExternalPowered() override use the
base-class default in MeshCore.h (returns false), so battery-powered
behaviour is unchanged everywhere.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
