"Show Call Hierarchy" should show all references for multiple calls in the same function

[pochienc]

When you trigger "Show Call Hierarchy" to see incoming calls, vscode/references-view only shows one reference (the first one) if multiple calls in the same function.

For example:

Here is simple code to illustrate how references-view displayed.

Bar2() calls Foo() at line 8 and 9 but only one reference visible in view. Although we can jump to the first call location where Foo() is invoked after including Fix 168307, we have no way of knowing that there are other locations where Foo() is also called in the same function Bar2() in view.

According to LSP definition of call hierarchy incoming calls, it shall use fromRanges properly by creating a single item for every reference.

https://microsoft.github.io/language-server-protocol/specifications/specification-current/#callHierarchy_incomingCalls

CallHierarchyIncomingCall {
  from: CallHierarchyItem;
  fromRanges: Range[];
}

Proposed Result

All but the first one are not collapsible because the call hierarchy is the same as the first one if a single callee contains multiple references. To distinguish each item and improve user-friendliness, file name and calling line are added in description of the item.

Environment

• Visual Studio Code version:

Version: 1.74.2 (Universal)
Commit: e8a3071ea4344d9d48ef8a4df2c097372b0c5161
Date: 2022-12-20T10:26:09.430Z (5 days ago)
Electron: 19.1.8
Chromium: 102.0.5005.167
Node.js: 16.14.2
V8: 10.2.154.15-electron.0
OS: Darwin x64 20.6.0
Sandboxed: No

[pochienc]

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[simon8233]

I would appreciate it
if the community could kindly help review this check-in.
I believe it provides a good optimization for VSCode users.
If possible, could @jrieken arrange some time to assist with reviewing these changes?
Thank you very much for your kind assistance.

[andyleo0831]

LGTM

[simon8233]

I think it's important feature for trace code, please help to review this PR

[simon8233]

LGTM

[pochienc]

Hi @jrieken, kindly inform me if I overlooked any procedures or steps, ensuring the review process doesn't encounter any disruptions. Thank you.

[cgarrovillo]

looks like this could be moved forward?

[vivodi]

Is this still relevant?

[GrimmiMeloni]

Is this still relevant?

I think so. I came here looking for a solution to the exact problem. It has been nagging me for a while.

[AdrianB-sovo]

I'm also interested, especially on the possibility to see the file names, which is an improvement I've been looking for, for a very long time.
When a function is called in multiple files, sometime from other functions with the same names — imagine functions like handle() —, it would be very helpful.

P.S. — In my case, it's for Python (in case it's important).

EDIT: If we're crazy, it could even be interesting to show the Class if it's a class method.
If it's too problematic to show it directly in the view, in a toolip when hovering would already be a good improvement.

@jrieken