QML Designer does not honor "Always save before build" flag.

When clicking the run button after changing a file in the QML designer a window will pop up warning about unsaved changes with a "Always save files before build" checkbox. This warning pops up even though that checkbox was already checked before after changing a file in the normal editor and clicking the run button.

Steps to reproduce:
1) Start with a clean configuration
2) Create a new QML project.
3) In the text editor: Open a .qml file and change something (e.g. the text).
4) Hit the run button.
5) Check "Always save files before build" in the warning that pops up.
6) close the application
7) Switch into the designer
8) Change the text again in the designer
9) Click the run button.

Actual result:
The "Save Changes" dialog shows again with the "Always save files before build" check box unchecked

Expected result:
The change is saved and no message is shown at all.