EffectMaker view gets reset and changes are not saved when a user switches between .qml files.

Steps to reproduce:

1. Open Screen01.ui.qml file
2. Go to assets, press right mouse button, press New Effect
3. Add nodes to the new effect
4. Do not save the changes
5. Open the App.qml file

Description

After step 5) the view of the EffectMaker gets reset and all the changes done to the effect (that were not saved) are lost. Now, EffectMaker displays the Untitled empty effect.

Expected behavior

The effect opened by a user should not be reset to an Untitled one. Especially, the changes done to the effect should not be lost.