Move Type Hierarchy implementation to LSP #2376
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Requires eclipse-jdtls/eclipse.jdt.ls#2033
The change is able to review/merge, but we will get several BREAKING changes, so feel free to discuss we can now continue the process or wait for further changes.
Pros:
Cons:
The type hierarchy in LSP only supports supertype hierarchy and subtype hierarchy, no class hierarchy. We should still hold custom implementations about the class hierarchy view.
Since "Show Type Hierarchy" is contributed from language client/vscode itself, we have no way to control its behavior, so the default view of "Show Type Hierarchy" would be the subtype hierarchy view. We added a new entry "Show Class hierarchy" to open the class hierarchy view by default.
As for those types have no children, the star will always show there. This is also the limitation of current call hierarchy view.