The tree view rendering performance is optimized by improving the node
render queue ordering. The node rendering order is modified based on the
expansion state and the depth in the hierarchy, leading to faster
rendering of visible nodes. This optimization is applied when the tree
nodes are not expanded to improve the rendering speed.
This new ordering ensures that nodes are rendered more efficiently,
prioritizing nodes that are collapsed and are at a higher level in the
hierarchy.
This commit fixes an issue where the check state of categories was lost
when toggling between card and tree views. This is solved by immediately
emitting node state changes for all nodes. This ensures consistent view
transitions without any loss of node state information.
Furthermore, this commit includes added unit tests for the modified code
sections.
