close popup menu when node goes out of view area

reuse single context menu instance

add context menu

set content rect properly

hide invisible nodes explicitly

make view flickable and add margins to test behavior

extract GraphView component

highlight both parent and child edges

leverage unordered_map::at()

make switch statement exhaustive

move Role enum to implementation

show replica nodes

count number of rows reserved for descendant nodes

highlight parent edge on hover

extract GraphEdge

add nodeType property

move GraphLayoutNode to GraphLayoutModel's private

extract node item to GraphNode.qml

switch to scoped enum

emit dataChanged by updateLayout() to simplify interface