Add display search results using relative paths to project root

Task-number: QTCREATORBUG-29462
Change-Id: Ic5d597846cfcc6589cbf1b81151e05c95ee8fab0
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/icore.cpp

@@ -1093,6 +1093,25 @@ void ICore::restart()
     exit();
 }
 
+/*!
+    \internal
+*/
+void ICore::setRelativePathToProjectFunction(const std::function<FilePath(const FilePath &)> &func)
+{
+    m_core->m_relativePathToProject = func;
+}
+
+/*!
+    \internal
+*/
+FilePath ICore::pathRelativeToActiveProject(const FilePath &path)
+{
+    if (m_core->m_relativePathToProject)
+        return m_core->m_relativePathToProject(path);
+
+    return path;
+}
+
 /*!
     \internal
 */