Gracefully handle the case where the machine manager is requested to
delete the last machine in Cura. In this case, instead of deleting
everything of this machine and still keep it as an active machine,
the machine manager will set the active machine to None.
The QML files which depend on the active machine were changed to
properly handle themselves when there is no active machine.
CURA-7454
This prevents a QML warning when the ListModel is created before the property provider is. This QML warning looked like this:
2020-03-20 15:04:30,012 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [406]: file:///home/trin/Gedeeld/Projects/Cura/cura/../resources/qml/MachineSettings/ComboBoxWithOptions.qml:74: TypeError: Cannot call method 'match' of undefined
Done during Turbo Testing and Tooling.
This widget can't set its width to the width of its children, since its children anchor to its right-hand side which depends on the width.
This fixes the following warning in the log:
2020-03-20 14:25:20,351 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [406]: file:///home/trin/Gedeeld/Projects/Cura/plugins/PrepareStage/PrepareMain.qml:16:5: QML ActionPanelWidget: Binding loop detected for property width
Done during Turbo Testing and Tooling.
Fixes the following QML warning in the logs:
2020-03-20 14:02:13,482 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [406]: file:///home/trin/Gedeeld/Projects/Cura/resources/qml/PrintSetupSelector/Recommended/RecommendedSupportSelector.qml:125:13: Unable to assign [undefined] to int
Instead it now assigns the first extruder before a printer has been created. The first extruder also doesn't exist yet at this point, but this doesn't really matter because there is no interface to show yet at this point.
Done during Turbo Testing and Tooling.
This fixes a bug where the NoIntent tooltip was hidden by the intent
description
CURA-6936
(cherry picked from commit 315b93a1525ba53f520f12b09669668266f12c6c)
It would previously blink if you pressed the button, as a click outside would hide it
due to close policy, but a mouse release would show it again (as it's hidden and that's what the
on clicked of the button did)
CURA-6598
