Debugger: Don't register identical debuggers (unless forced)

User code can decide whether it wants something added unconditionally
(by creating a DebuggerItem with valid id), or let the manager re-use
something matching or create an id.

Task-number: QTCREATORBUG-10641
Change-Id: I4f5a1fbe881932ba5608f5c6116b4ea8352f8903
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/debugger/debuggeritem.cpp

@@ -33,6 +33,7 @@
 
 #include <projectexplorer/abi.h>
 #include <utils/fileutils.h>
+#include <utils/qtcassert.h>
 
 #include <QProcess>
 #include <QUuid>
@@ -56,7 +57,6 @@ namespace Debugger {
 
 DebuggerItem::DebuggerItem()
 {
-    m_id = QUuid::createUuid().toString();
     m_engineType = NoEngineType;
     m_isAutoDetected = false;
 }
@@ -84,6 +84,12 @@ DebuggerItem::DebuggerItem(const QVariantMap &data)
     }
 }
 
+void DebuggerItem::createId()
+{
+    QTC_ASSERT(!m_id.isValid(), return);
+    m_id = QUuid::createUuid().toString();
+}
+
 void DebuggerItem::reinitializeFromFile()
 {
     QProcess proc;