fix(tree): apply selected line style to edges. close #18214

[rahul37wallst-sudo]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Applies configured select.lineStyle to tree node edges when tree nodes are selected.

Fixed issues

• [Bug] Changing selected node's linestyle doesn't work #18214: Tree series select.lineStyle did not affect the selected node's branch/edge.

Details

Before: What was the problem?

Tree node symbols could enter the select state correctly, so select.itemStyle worked on the selected node.

However, the tree edge/branch is rendered as a sibling element of the node symbol group, not as a child of it. The generic selection update only marks the node symbol group as selected, so the edge never entered the select state even though its select.lineStyle state style was already configured.

After: How does it behave after the fixing?

Tree edges now mirror the selection state of their corresponding tree nodes.

The fix updates tree edge selection in TreeView by applying enterSelect / leaveSelect to each node edge based on seriesModel.isSelected(dataIndex). It runs after render and during select, unselect, and toggleSelect actions, so both initial selected state and later selection changes are handled.

A regression unit test was added to verify that:

• select.lineStyle.color is stored on the tree edge select state;
• selecting a tree node marks its edge as selected;
• single-select selection clears the previously selected edge and selects the new edge.

Document Info

One of the following should be checked.

• This PR doesn't relate to document changes
• The document should be updated later
• The document changes have been made in apache/echarts-doc#xxx

Misc

Security Checking

• This PR uses security-sensitive Web APIs.

ZRender Changes

• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

test/ut/spec/series/tree.test.ts

Validation run:

npx jest --config test/ut/jest.config.cjs --coverage=false --runInBand --runTestsByPath test/ut/spec/series/tree.test.ts
npm run checktype
npm run lint
npx eslint test/ut/spec/series/tree.test.ts
git --no-pager diff --check

Merging options

• Please squash the commits into a single one when merging.

Other information

N.A.