M4: RIDDLE: Hard crash when looking at copper tank viewer in the Odditorium

[afreickmann]

What happens:
If you look at the copper tank viewer in the Odditorium at the start of the game, ScummVM crashes and enters the debugger.

Error output:
fl (01dc): op_ADD IDX_CELS_INDEX, 65536
fl (01e4): op_COMPARE IDX_CELS_INDEX, REG 36
fl (01ec): op_BRANCH 65536, -720896
fl (01c8): op_SETCEL IDX_CELS_HASH, IDX_CELS_INDEX

ERROR: CreateSprite: Sprite index out of range - max index: 5, requested index: 6!
Additional notes:
If you look at the same object near the end of the game, it does not crash.
However, the inventory stays visible during the interaction, which shouldn't happen.

Expected behavior:
Ripley should be able to look at the copper tank viewer without crashing the game, and the inventory should be hidden during cutscenes or look interactions.

[Strangerke <arnaud.boutonne@…>]

In 0178b529:

M4: RIDDLE: Fix for bug #16075 in room 303: Crash after looking at the copper tank viewer before visiting room 301

[Strangerke]

I fixed the crash. The second part of the ticket related to the inventory is problematic: I don't manage to reproduce it, it's hidden before and after visiting Room301 (posh NY)