Set a sensible minimum width for the window

cura/CuraApplication.py

@@ -809,3 +809,7 @@ class CuraApplication(QtApplication):
 
     def _addProfileWriter(self, profile_writer):
         pass
+
+    @pyqtSlot("QSize")
+    def setMinimumWindowSize(self, size):
+        self.getMainWindow().setMinimumSize(size)

resources/qml/Cura.qml

@@ -17,6 +17,11 @@ UM.MainWindow
     title: catalog.i18nc("@title:window","Cura");
     viewportRect: Qt.rect(0, 0, (base.width - sidebar.width) / base.width, 1.0)
 
+    Component.onCompleted:
+    {
+        Printer.setMinimumWindowSize(UM.Theme.getSize("window_minimum_size"))
+    }
+
     Item
     {
         id: backgroundItem;

resources/themes/cura/theme.json

@@ -157,6 +157,7 @@
     },
 
     "sizes": {
+        "window_minimum_size": [70, 54],
         "window_margin": [1.0, 1.0],
         "default_margin": [1.0, 1.0],
         "default_lining": [0.08, 0.08],