Save the state of collapsed/expanded categories

Fixes Asana issue 36436828173802

cura/CuraApplication.py

@@ -73,6 +73,7 @@ class CuraApplication(QtApplication):
         Preferences.getInstance().addPreference("cura/active_machine", "")
         Preferences.getInstance().addPreference("cura/active_mode", "simple")
         Preferences.getInstance().addPreference("cura/recent_files", "")
+        Preferences.getInstance().addPreference("cura/categories_expanded", "")
 
         JobQueue.getInstance().jobFinished.connect(self._onJobFinished)
 
@@ -322,6 +323,20 @@ class CuraApplication(QtApplication):
     def recentFiles(self):
         return self._recent_files
 
+    @pyqtSlot("QStringList")
+    def setExpandedCategories(self, categories):
+        categories = list(set(categories))
+        categories.sort()
+        joined = ";".join(categories)
+        if joined != Preferences.getInstance().getValue("cura/categories_expanded"):
+            Preferences.getInstance().setValue("cura/categories_expanded", joined)
+            self.expandedCategoriesChanged.emit()
+
+    expandedCategoriesChanged = pyqtSignal()
+    @pyqtProperty("QStringList", notify = expandedCategoriesChanged)
+    def expandedCategories(self):
+        return Preferences.getInstance().getValue("cura/categories_expanded").split(";")
+
     outputDevicesChanged = pyqtSignal()
     
     @pyqtProperty("QVariantMap", notify = outputDevicesChanged)

resources/qml/SidebarAdvanced.qml

@@ -1,6 +1,13 @@
 // Copyright (c) 2015 Ultimaker B.V.
 // Cura is released under the terms of the AGPLv3 or higher.
 
+import QtQuick 2.0
+
+import QtQuick.Controls 1.2
+
 import UM 1.0 as UM
 
-UM.SettingView { }
+UM.SettingView {
+    expandedCategories: Printer.expandedCategories;
+    onExpandedCategoriesChanged: Printer.setExpandedCategories(expandedCategories);
+}