The workaround on edge crashing is to use the mouse area around the edge and query if the click exists in the edge to accept pressed or released signal
The curve scale of the mouse area for an edge used to be defined when
initializing the `EdgeMouseArea` for that edge. Setting it triggers a
chain of event that allow the mouse area to be active, thus correctly
detecting when it is being hovered or clicked on.
With Qt6, these events unfolded before the `EdgeMouseArea` had finished
initializing, which then caused it to not be active until the edge's
shape was modified (and the chain of events triggered again). It is now
set once the component has been created, so all the events can happen
in an environment where they are taken into account.
This commit addresses warnings that were raised by QtCreator's linter:
- IDs declared more than once
- variables declared more than once in the same scope
- type coercions
- variables declared as "var" when their type is known
- unclosed "case" in switch-case
- Avoid variation in dash pattern when the stroke is hovered by compensating strokeWidth.
- Use a dash pattern of [6,4] to get a stronger feeling of a dashed line (VS a dotted line).
* increase EdgeMouseArea thickness for easier picking
* EdgeMouseArea: propagate modifiers on pressed
* increase edge visual thickness when hovered
* add edge contextual menu on right click
* Alt+RighClick shortcut to delete an edge
