[Bug] Gemini model does not handle multiple text parts

[nilnor]

Description

The Gemini's parse_provider_response method does not handle multiple text parts. Now, I do not know why on earth the genapi/API returns multiple parts only containing "text" to begin with, but it does..

Example of a response as seen from HTTP logs:

"candidates": [
  {
    "content": {
      "parts": [
        {
          "text": "Well here's one line\n"
        },
        {
          "text": "and another..\n"
        },
        {
          "text": "and it goes on.. :("
        }
      ]
    }
  }
]     

The current implementation goes through each part and assigns a part with "text" as the content, actually only assigning the last part as the message. As said I don't know why the response would be like this, but the current assumption of there being only one text part is clearly wrong.

Steps to Reproduce

Get the model to generate a response like this and check the incoming data.

Agent Configuration (if applicable)

No response

Expected Behavior

Text parts should be concatenated and returned as the response's content.

Actual Behavior

Only the last part is reported as the response's content.

Screenshots or Logs (if applicable)

No response

Environment

Anything capable of using the library

Possible Solutions (optional)

See above.

Additional Context

No response

[linear]

SUPPORT-180 [Bug] Gemini model does not handle multiple text parts

[nilnor]

Some additional info: This is with Gemini 2.5 pro (gemini-2.5-pro-preview-05-06). AI being what it is it now happens only irregularly.. Still, handling this case in the code would account for it.