qbs build: Export relevant include paths from QmlDesigner product.

Change-Id: I79dc9a02cd5d2450ee733dc83d5dc8f103783b15
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

src/plugins/qmldesigner/qmldesignerplugin.qbs

@@ -2,9 +2,12 @@ import qbs 1.0
 
 import QtcPlugin
 
-QtcPlugin {
+Project {
     name: "QmlDesigner"
 
+    QtcDevHeaders { }
+
+    QtcPlugin {
         Depends {
             name: "Qt";
             submodules: [
@@ -55,6 +58,15 @@ QtcPlugin {
 
         Export {
             Depends { name: "QmlJS" }
+            cpp.includePaths: base.concat([
+                ".",
+                "components/componentcore",
+                "components/formeditor",
+                "components/integration",
+                "designercore",
+                "designercore/include",
+                project.ide_source_tree + "/share/qtcreator/qml/qmlpuppet/interfaces",
+            ])
         }
 
         Group {
@@ -624,3 +636,4 @@ QtcPlugin {
             "styledoutputpaneplaceholder.h",
         ]
     }
+}