Ensure that CSS rules are inherited from the parent tags

When CSS is set in a head tag then it was not being inherited by the child
tags when the CSS specification indicates that the properties are in fact
inherited. This ensures that those properties are inherited and the non
inheritable ones are unchanged.

A test is added to cover the different situations with inheritance and a
fix is done for the QTextDocumentFragment test which was passing despite
having incorrect defaults.

Task-number: QTBUG-28770
Task-number: QTBUG-34153
Change-Id: I55966240845a885852a04ecb82c61926dea9f800
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/gui/text/qcssparser.cpp b/src/gui/text/qcssparser.cpp
index f9e6a7e335..3c98cb568d 100644
--- a/src/gui/text/qcssparser.cpp
+++ b/src/gui/text/qcssparser.cpp
@@ -364,6 +364,29 @@ static quint64 findKnownValue(const QString &name, const QCssKnownValue *start,
     return prop->id;
 }
 
+static inline bool isInheritable(Property propertyId)
+{
+    switch (propertyId) {
+    case Font:
+    case FontFamily:
+    case FontSize:
+    case FontStyle:
+    case FontWeight:
+    case TextIndent:
+    case Whitespace:
+    case ListStyleType:
+    case ListStyle:
+    case TextAlignment:
+    case FontVariant:
+    case TextTransform:
+    case LineHeight:
+        return true;
+    default:
+        break;
+    }
+    return false;
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // Value Extractor
 ValueExtractor::ValueExtractor(const QVector<Declaration> &decls, const QPalette &pal)
@@ -2317,6 +2340,7 @@ bool Parser::parseProperty(Declaration *decl)
 {
     decl->d->property = lexem();
     decl->d->propertyId = static_cast<Property>(findKnownValue(decl->d->property, properties, NumProperties));
+    decl->d->inheritable = isInheritable(decl->d->propertyId);
     skipSpace();
     return true;
 }