[BUG(ish)] Text entry in text fields in RPN mode

[orcinus]

While editing any of the text input fields that accept algebraic input in apps (e.g. Function or Advanced Graphing), if you hit Edit then press SIN, you will get:

'SIN()'

with the cursor positioned between the parentheses (as expected).
If, however you don't press Edit and instead hit SIN straight away, you will get:

SIN<space>

(no single quotes, no parentheses, extra space).
This, of course, only happens if Home is in RPN mode. But that shouldn't matter, because Edit defaults into algebraic entry via the single quotes. Typing without hitting Edit should too, in this context, methinks.