Fix for QShaderNode fix that selected highest version number of a rule

The rule selection still has to be made from last added rule to first
so that format.support works correctly.

- Update QShaderNode unit tests

Change-Id: I47af898ee0d82e91009efccf1dca9937feaca717
Reviewed-by: Mike Krus <mike.krus@kdab.com>
(cherry picked from commit 21168905a7eda8806543b490a0fae5a5a0ec7cad)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/render/shadergraph/qshadernode.cpp b/src/render/shadergraph/qshadernode.cpp
index b95a77b04..b06b9c84e 100644
--- a/src/render/shadergraph/qshadernode.cpp
+++ b/src/render/shadergraph/qshadernode.cpp
@@ -153,7 +153,8 @@ QList<QShaderFormat> QShaderNode::availableFormats() const
 QShaderNode::Rule QShaderNode::rule(const QShaderFormat &format) const
 {
     const QPair<QShaderFormat, Rule> *selected = nullptr;
-    for (const auto &entry : qAsConst(m_rules)) {
+    for (auto it = m_rules.crbegin(); it != m_rules.crend(); ++it) {
+        const auto &entry = *it;
         if (format.supports(entry.first)) {
             if (!selected || entry.first.version() > selected->first.version())
                 selected = &entry;