Well this is already an incompatibility between different versions. We should
fix this (I want to add an actual "Trigger script" conditional) but not without
a backcompat bit, it would probably break a huge number of games because it's
easy to stumble upon, and before ypsiliform "Instead: run script" acted much
like a "Trigger script" conditional so probably people thought it was a feature
not a bug. We don't need to emulate every aspect of it (such as the incorrect
value returned by `current textbox`). Really we should also have a second
backcompat bit emulate the old pre-ypsiliform behaviour. (Probably werewaffle
rather than xocolatl.)
I created a test game using werewaffle+
([tbtest.zip](https://github.com/ohrrpgce/ohrrpgce/files/11206401/tbtest.zip)).
It's set up to open TB 1 from the NPC. r2206 didn't change the behaviour the
way I expected, but it did change something.
In werewaffle+ (2008, before modernisation of the textbox code, including
r2206):
----------
If TB 1 is triggered from an NPC, TB 1 shows as normal, then TB 2 *also* shows
and `insteadscript` runs, and when TB 2 is advanced, conditionals such as "gain
$" are evaluated and After TB 3/`afterscript` run! However, conditionals meant
to happen when TB 2 is displayed, such as setting tags, aren't run, and its
choicebox and appearance settings (e.g. box position and backdrop) are ignored,
it uses TB 1's appearance. This is because in werewaffle, text and conditionals
were loaded before 'Instead' was checked, then it loaded appearance (into
`sayenh()`), updated choicebox, set tags, etc.
If `insteadscript` runs `advance text box`, the result is the same as today
except that TB 2 shows for one tick (because the script is only run the next
tick), using TB 1's appearance settings.
If TB 2 is triggered directly from an NPC, the behaviour seems the same as
today, including when `advance text box` is called.
In xocolatl+2 (2009), after r2206:
----------
Everything seems to be the same as werewaffle, except now TB 2 appears with its
proper appearance settings and with its choicebox.
In ypsiliform+3 (2010), which converted text boxes to slices:
----------
Everything seems the same as today, with TB 2 no longer showing when it has an
Instead script condition.
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