Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.98.2
• OS Version: MacOS Sequoia Version 15.3.2

Currently, the CustomEditor is launched for all *.js files. As a result, when opening a file from the search panel or GitLens, the CustomEditor is triggered.

To prevent this, we need the getContext API to check whether the file is being opened from the search panel before launching the editor.

Alternatively, if a when clause could be added to the customEditor configuration, it would help resolve the issue. For example:

"customEditors": [
  {
    "viewType": "builder.BasicTextEditor",
    "displayName": "Basic Text Editor",
    "selector": [
      {
        "filenamePattern": "*.js"
      }
    ],
    "priority": "default"
  }
]

If the when clause is supported, I could use the following condition to control when the editor opens:

"when": "sideBarFocus && activeViewlet !== 'workbench.view.search'"

There is already an open issue for this, and I urgently need a fix for my product. If there is any workaround to retrieve the context, that would also be helpful.

I also noticed that a getContext API request has already been raised in the following issue:
#10471

Would appreciate any guidance or possible workarounds. Thanks!