Utils: Add a ProxyAction factory which overrides an action icon

There are several places where we want to override an icon when adding
an action to a toolbar and to a menu, because we need to different
icon variations.

Change-Id: I0bed4d002b8f83c9ce3278137aa463c20d1dc7be
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/utils/proxyaction.cpp

@@ -175,3 +175,12 @@ QString ProxyAction::stringWithAppendedShortcut(const QString &str, const QKeySe
     return QString::fromLatin1("%1 <span style=\"color: gray; font-size: small\">%2</span>").
             arg(s, shortcut.toString(QKeySequence::NativeText));
 }
+
+ProxyAction *ProxyAction::proxyActionWithIcon(QAction *original, const QIcon &newIcon)
+{
+    ProxyAction *proxyAction = new ProxyAction(original);
+    proxyAction->setAction(original);
+    proxyAction->setIcon(newIcon);
+    proxyAction->setAttribute(UpdateText);
+    return proxyAction;
+}

src/libs/utils/proxyaction.h

@@ -58,6 +58,7 @@ public:
     bool hasAttribute(Attribute attribute);
 
     static QString stringWithAppendedShortcut(const QString &str, const QKeySequence &shortcut);
+    static ProxyAction *proxyActionWithIcon(QAction *original, const QIcon &newIcon);
 
 private slots:
     void actionChanged();