Q{Calendar,Contact}Permission: invert default state of isReadOnly

The QLocationPermission properties default to the least-intrusive
capabilities: Availability::WhenInUse (not: Always) and
Accuracy::Approximate (not: Precise).

Logically, QCalendar- and ContactPermission's readOnly property should
then default to read-only access, not read-write.

Orthogonally to this change of default value, it might make sense to
invert the name of the property, too: isReadWrite() or
hasWriteAccess().

Pick-to: 6.5
Change-Id: I9359c82051b1a6735feca8b2f06b9891acef650f
Reviewed-by: Tor Arne Vestbø <[email protected]>

src/corelib/kernel/qpermissions.cpp

@@ -432,8 +432,8 @@ QLocationPermission::Availability QLocationPermission::availability() const
     \class QContactsPermission
     \brief Access the user's contacts.
 
-    By default the request is for both read and write access.
-    Use setReadOnly() to override the default.
+    By default the request is for read-only access.
+    Use setReadOnly(false) to override the default.
 
     \section1 Requirements
 
@@ -454,7 +454,7 @@ QLocationPermission::Availability QLocationPermission::availability() const
 class QContactsPermissionPrivate : public QSharedData
 {
 public:
-    bool isReadOnly = false;
+    bool isReadOnly = true;
 };
 
 QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(QContactsPermission)
@@ -480,8 +480,8 @@ bool QContactsPermission::isReadOnly() const
     \class QCalendarPermission
     \brief Access the user's calendar.
 
-    By default the request is for both read and write access.
-    Use setReadOnly() to override the default.
+    By default the request is for read-only access.
+    Use setReadOnly(false) to override the default.
 
     \section1 Requirements
 
@@ -502,7 +502,7 @@ bool QContactsPermission::isReadOnly() const
 class QCalendarPermissionPrivate : public QSharedData
 {
 public:
-    bool isReadOnly = false;
+    bool isReadOnly = true;
 };
 
 QT_DEFINE_PERMISSION_SPECIAL_FUNCTIONS(QCalendarPermission)