QUnicodeTools: prefer lineBreakClass() convenience function

... where applicable

Simplifies the code.

In some cases, the code queries more than one property of the
character, in which case we keep using qGetProp().

Amends 85899ff and
1f73d4b.

Pick-to: 6.10 6.8 6.5
Change-Id: I27cc0e5607b1e730f649c9d73f05f6b1227bdd17
Reviewed-by: Mårten Nordheim <[email protected]>

Author: marcmutz

src/corelib/text/qunicodetools.cpp

@@ -781,8 +781,7 @@ static void getLineBreaks(const char16_t *string, qsizetype len, QCharAttributes
                         if (QChar::isLowSurrogate(low))
                             c = QChar::surrogateToUcs4(c, low);
                     }
-                    nncls = QUnicodeTables::LineBreakClass(
-                            QUnicodeTables::properties(c)->lineBreakClass);
+                    nncls = QUnicodeTables::lineBreakClass(c);
                 }
 
                 constexpr QUnicodeTables::LineBreakClass lb15b[] = {
@@ -879,8 +878,7 @@ static void getLineBreaks(const char16_t *string, qsizetype len, QCharAttributes
                         if (QChar::isLowSurrogate(low))
                             ch = QChar::surrogateToUcs4(ch, low);
                     }
-                    if (QUnicodeTables::properties(ch)->lineBreakClass
-                        == QUnicodeTables::LineBreak_NU) {
+                    if (QUnicodeTables::lineBreakClass(ch) == QUnicodeTables::LineBreak_NU) {
                         attributes[pos].lineBreak = true;
                         goto next;
                     }