Changing class or level should recalculate current HP to adapt to new max HP
Summary
Currently, if you change the recognized class or level of a player character, maximum HP are changed, current HP are not.
Current HP should have the delta between previous and new maximum HP applied.
SRD, pg. 346:
Characters advance a level after three or four full heal-ups, i.e. between twelve and sixteen serious battles. The whole party levels up together.
Further down, for incremental advances:
Hit Points
Your maximum hit points increase as if you were one level higher. If you’re presently damaged while mid-adventure, your current hit points increase by the same amount.
Labels (do-not-change)
Edited by Max Hilbrunner