ProjectExplorer: Improve "import project" keyboard event handling

Pressing return in the path chooser used to activate the "Configure"
button, which is not what users intend.

Fixes: QTCREATORBUG-17471
Change-Id: I86bc0dd9c976da35026654c7873dc4b63e45593c
Reviewed-by: hjk <hjk@qt.io>

src/plugins/projectexplorer/importwidget.h

@@ -44,6 +44,8 @@ public:
 
     void setCurrentDirectory(const Utils::FilePath &dir);
 
+    bool lineEditHasFocus() const;
+
 signals:
     void importFrom(const Utils::FilePath &dir);