debugger: update bp target line when editing file while engine running

Task-number: QTCREATORBUG-2314
Change-Id: If79f3aa70f932b82905351828b28fde42824c90e
Reviewed-on: http://codereview.qt.nokia.com/303

Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/breakhandler.cpp

@@ -1048,15 +1048,17 @@ void BreakHandler::updateLineNumberFromMarker(BreakpointId id, int lineNumber)
     Iterator it = m_storage.find(id);
     it->response.pending = false;
     BREAK_ASSERT(it != m_storage.end(), return);
-    if (it->response.lineNumber != lineNumber) {
-        // FIXME: Should we tell gdb about the change?
-        it->response.lineNumber = lineNumber;
-    }
     // Ignore updates to the "real" line number while the debugger is
     // running, as this can be triggered by moving the breakpoint to
     // the next line that generated code.
-    if (!isEngineRunning(id))
+    if (isEngineRunning(id))
+        it->data.lineNumber += lineNumber - it->response.lineNumber;
+    else
         it->data.lineNumber = lineNumber;
+    if (it->response.lineNumber != lineNumber) {
+        // FIXME: Should we tell gdb about the change?
+        it->response.lineNumber = lineNumber;
+    }
     updateMarker(id);
     emit layoutChanged();
 }