CppTools: Update document on activation

...if the project was updated in the meanwhile.

If a project is updated mark invisible editor documents dirty and update
them if they get focus.

This also fixes document highlighting when restoring a session for
documents that the user "switched away" before the project info is
pushed to CppModelManager.

This completes

    CppTools: Update visible documents on project update
    commit c2eb91e053

which only takes care of visible documents.

Task-number: QTCREATORBUG-13270
Change-Id: Id445e7f509deac5d03194aecc54ce4629b7926ce
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>

src/plugins/cpptools/editordocumenthandle.cpp

@@ -40,6 +40,7 @@ namespace CppTools {
 */
 
 EditorDocumentHandle::EditorDocumentHandle()
+    : m_needsRefresh(false)
 {
 }
 
@@ -47,4 +48,14 @@ EditorDocumentHandle::~EditorDocumentHandle()
 {
 }
 
+bool EditorDocumentHandle::needsRefresh() const
+{
+    return m_needsRefresh;
+}
+
+void EditorDocumentHandle::setNeedsRefresh(bool needsRefresh)
+{
+    m_needsRefresh = needsRefresh;
+}
+
 } // namespace CppTools