`reasoningEffort` setting is applied to the wrong custom endpoint

Bug: reasoningEffort setting is applied to the wrong custom endpoint due to index mismatch (UI alphabetical sorting vs. array order)

Info

• Copilot Chat Extension Version: built-in
• VS Code Version: 1.124.0 (Universal)
• OS Version:
• Feature (e.g. agent/edit/ask mode): Chat UI
• Selected model (e.g. GPT 4.1, Claude 3.7 Sonnet): all
• Logs:

Description

When modifying the reasoningEffort for a custom endpoint via the Copilot Chat UI, the setting is incorrectly mapped back to the underlying configuration array using its sorted UI index, rather than its unique name or identifier.

Example: (Full example see below)
Given the following original configuration array:

[
  {"name": "Copilot", ...},          // Array index 0
  {"name": "B CustomEndpoint", ...}, // Array index 1
  {"name": "A CustomEndpoint", ...}  // Array index 2
]

Since the Chat UI sorts the endpoints alphabetically, "A CustomEndpoint" is displayed before "B CustomEndpoint".

When attempting to change the reasoningEffort for "A CustomEndpoint" in the UI, the system uses the alphabetical index (index 1) and incorrectly applies the setting to the object at index 1 of the original array (which is "B CustomEndpoint").

As a result, the following object is mistakenly injected into "B CustomEndpoint":

[
  {"name": "Copilot", ...},
  {
    "name": "B CustomEndpoint", ...,
    "settings": {
      "model-b": {
        "reasoningEffort": "high"
      }
  },
  {"name": "A CustomEndpoint", ...}

Expected Behavior

The UI should map the reasoningEffort update using the endpoint's name or ID to look up the correct object in the array, rather than relying on the array index which breaks when the UI list is sorted.

Full Example

Before selecting thinking effort in UI:

[
  {
    "name": "B CustomEndpoint",
    "vendor": "customendpoint",
    "apiKey": "${input:chat.lm.secret.e079954}",
    "apiType": "chat-completions",
    "models": [
      {
        "id": "b-ai-1",
        "name": "B-AI-1",
        "url": "https://[redacted].com/v1/chat/completions",
        "apiType": "chat-completions",
        "toolCalling": true,
        "vision": true,
        "thinking": true,
        "maxInputTokens": 400000,
        "maxOutputTokens": 128000,
        "supportsReasoningEffort": ["none", "low", "medium", "high", "xhigh"]
      }
    ]
  },
  {
    "name": "A CustomEndpoint",
    "vendor": "customendpoint",
    "apiKey": "${input:chat.lm.secret.e079954}",
    "apiType": "chat-completions",
    "models": [
      {
        "id": "a-ai-1",
        "name": "A-AI-1",
        "url": "https://[redacted].com/v1/chat/completions",
        "apiType": "chat-completions",
        "toolCalling": true,
        "vision": true,
        "thinking": true,
        "maxInputTokens": 400000,
        "maxOutputTokens": 128000,
        "supportsReasoningEffort": ["low", "medium", "high", "max"]
      }
    ]
  }
]

After:

[
  {
    "name": "B CustomEndpoint",
    "vendor": "customendpoint",
    "apiKey": "${input:chat.lm.secret.e079954}",
    "apiType": "chat-completions",
    "models": [
      {
        "id": "b-ai-1",
        "name": "B-AI-1",
        "url": "https://[redacted].com/v1/chat/completions",
        "apiType": "chat-completions",
        "toolCalling": true,
        "vision": true,
        "thinking": true,
        "maxInputTokens": 400000,
        "maxOutputTokens": 128000,
        "supportsReasoningEffort": ["none", "low", "medium", "high", "xhigh"]
      }
    ],
    "settings": {
      "a-ai-1": {
        "reasoningEffort": "max"
      }
    }
  },
  {
    "name": "A CustomEndpoint",
    "vendor": "customendpoint",
    "apiKey": "${input:chat.lm.secret.e079954}",
    "apiType": "chat-completions",
    "models": [
      {
        "id": "a-ai-1",
        "name": "A-AI-1",
        "url": "https://[redacted].com/v1/chat/completions",
        "apiType": "chat-completions",
        "toolCalling": true,
        "vision": true,
        "thinking": true,
        "maxInputTokens": 400000,
        "maxOutputTokens": 128000,
        "supportsReasoningEffort": ["low", "medium", "high", "max"]
      }
    ]
  }
]