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* [CardDB] Sort power/toughness without splitting every comparison
When the card database is sorted by the P/T column, lessThan() runs
O(n log n) times over the whole view, and each call split both strings
into a QStringList ("power/toughness") and then read the two elements
back. For the roughly 36k cards in the database that is millions of
list and string allocations, all for a value that contains at most one
separator.
The comparator now locates the single '/' with indexOf and passes the
two halves as QStringView to lessThanNumerically(), which is changed
from QString to QStringView. The numeric parsing, the "1+*" fallback and
the locale-aware tie-break are unchanged, and strings with no separator
or more than one still fall through to the plain string comparison,
exactly as split()-based size checks did before.
lessThanNumerically() also initializes its two bool out-parameters; they
were declared uninitialized, which only worked because toFloat() always
assigns them.
Compared old and new comparator over a corpus of 2024 power/toughness
strings (4096576 ordered pairs, including malformed values): zero
differences. Full build and ctest (628 tests) pass.
* Extract well-formedness checks in P/T comparator
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Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>
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