[Bug]: `partial_match` suffix check uses `virtual_suggestion` (prefix only) instead of full `suggestion`

[github-actions]

[PyDevC]

/oc can you describe this issue?

[opencode-agent]

Here's the bug analysis:

The Bug

In lua/model_cmp/utils.lua:82, the partial_match function checks if the suffix (text after cursor) exists in the suggestion, but it searches inside virtual_suggestion instead of the full suggestion.

The problem

virtual_suggestion is only the prefix portion of the suggestion (first #prefix characters), so when there's any text after the cursor, the suffix can never be found there, and the function always returns nil — rejecting even perfectly compatible suggestions.

Example

Buffer line: return 1;, cursor after return , model suggests return 1;:

• prefix = "return ", suffix = "1;", suggestion = "return 1;"
• virtual_suggestion = "return " (only first 7 chars)
• string.find("return ", "1;") → nil → incorrectly rejected

The fix on line 82 is to change virtual_suggestion → suggestion:

- local s, _ = string.find(virtual_suggestion, suffix)
+ local s, _ = string.find(suggestion, suffix)

Existing tests never hit this path because none of them have text after the cursor (curr == prefix in all cases, so suffix is always nil).

opencode session  |  github run

[PyDevC]

This doesn't seems right...

The reason why I am doing virtual_suggestion instead of full suggestion is because I want it to just search for the prefix instead of full suggestions otherwise it will show suggestions even for words like is or and in between the sentences.