Commit e0ea0f6178 optimized QChar <->
QString(Ref) comparisons by adding more overloads to avoid creating
QStrings from QChars just to compare them.
But these new overloads made existing comparisons to QChar ambiguous.
This was known at the time for QChar/int comparisons.
It has since turned out that also comparing to '\0' is ambiguous,
ie. not comparing to int or char per se is ambiguous, but comparing to
nullptr constants is, because QString(const char*) is just as good a
candidate as QChar(char)/QChar(int).
Since we allow QString/QChar comparisons, it seems logical to solve
the problem by adding QChar<->nullptr overloads.
[ChangeLog][QtCore][QChar] Disambiguated comparisons with nullptr
constants such as '\0', which 5.8.0 broke. As a consequence,
QChar<->int comparisons are no longer deprecated, as this was a failed
attempt at fixing the ambiguity.
Change-Id: I680dd509c2286e96894e13078899dbe3b2dd83bc
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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