Fix retain brightness when val is changed while a layer is active #18426
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Description
If
RGBLIGHT_LAYERS_RETAIN_VALis defined while lighting layers are used,rgblight_layers_write()checksrgblight_config.valfor the currently set brightness. However,rgblight_sethsv_eeprom_helper()updatesrgblight_config.valwith the newvalafter it callsrgblight_setrgb(), which ultimately callsrgblight_layers_write(). This means that if the brightness is changed while a lighting layer is active, the LEDs won't change to the new brightness until the lighting layer changes, or the HSV is changed again.Tested with Iris Rev. 3
Types of Changes
Issues Fixed or Closed by This PR
Checklist