gentoo-overlay/kde-apps/akonadi/files/akonadi-18.12.3-major-regression-updating-attributes.patch

From 1d8851495bcfa6ff5d3fa35882b68fdf68b21a7f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Vr=C3=A1til?= <dvratil@kde.org>
Date: Thu, 21 Mar 2019 13:22:58 +0100
Subject: Fix a regression when updating attributes

This fixes a regression introduced in 3a062e6a and 6054e42d where some
attributes were not sent to the Akonadi server in update job even though
they were modified. This was due to a bad API design which returns a
non-const pointer to an attribute from a const method, so callers sometimes
modify the returned attribute on a const object. Since the method itself
is const though, it did not mark the attribute as modified.

Proper fix is to introduce a purely const and non-const overloads for
the attribute accessors, unfortunatelly this requires fixing a lot of our code
in many places first to not abuse the non-constness of the returned
attribute.

Note that since the code is in an inlined method, all clients should be
recompiled.

CCMAIL: faure@kde.org
---
 src/core/collection.h | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/core/collection.h b/src/core/collection.h
index 50c0926..b5a496c 100644
--- a/src/core/collection.h
+++ b/src/core/collection.h
@@ -584,14 +584,19 @@ inline T *Akonadi::Collection::attribute(Collection::CreateOption option)
 template <typename T>
 inline T *Akonadi::Collection::attribute() const
 {
-    const T dummy;
-    if (hasAttribute(dummy.type())) {
-        T *attr = dynamic_cast<T *>(attribute(dummy.type()));
+    const QByteArray type = T().type();
+    if (hasAttribute(type)) {
+        T *attr = dynamic_cast<T *>(attribute(type));
         if (attr) {
+            // FIXME: This method returns a non-const pointer, so callers may still modify the
+            // attribute. Unfortunately, just making this function return a const pointer and
+            // creating a non-const overload does not work, as many users of this function abuse the
+            // non-const pointer and modify the attribute even on a const object.
+            const_cast<Collection*>(this)->markAttributesChanged();
             return attr;
         }
         //reuse 5250
-        qWarning() << "Found attribute of unknown type" << dummy.type()
+        qWarning() << "Found attribute of unknown type" << type
                    << ". Did you forget to call AttributeFactory::registerAttribute()?";
     }
 
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