Incorrect applying of apply_diff

[avtc]

App Version

3.11.14

API Provider

LM Studio

Model Used

athene-v2-chat@iq4_xs

Actual vs. Expected Behavior

The diff produced looks good, but applied wrongly by Roo:

The text version:
Original file:

7 | .chess-board-container {
8 |     display: flex;
9 |     gap: 1rem;
10 |     align-items: center;
11 | }
12 | 
13 | .overlay {
14 |     position: absolute;
15 |     top: 0;
16 |     left: 0;
17 |     width: 100%;
18 |     height: 100%;
19 |     background-color: rgba(0, 0, 0, 0.5);
20 |     z-index: 999; /* Ensure it's above the board but below the promotion dialog */
21 | }

The diff produced:

<<<<<<< SEARCH
:start_line:12
:end_line:13
-------
.overlay {
=======

.piece {
    will-change: transform;
}

.overlay {
>>>>>>> REPLACE

The final result:

10 |     align-items: center;
11 | }
12 | .piece {
13 |     will-change: transform;
14 | }
15 | 
16 | .overlay {
17 | .overlay {

======
Another attempt:

The diff:

<<<<<<< SEARCH
:start_line:11
:end_line:13
-------
}
 

.overlay {
=======

}
.piece {
    will-change: transform;
}

.overlay {
>>>>>>> REPLACE

In the final result line with 14 | position: absolute; was deleted.

Detailed Steps to Reproduce

I am working on custom prompt for apply_diff to add context lines for better match the content, so idk if the model will produce same diff content with standard prompt, but with standard prompt I also had similar issues with applying correct diffs.

Probably unit-test will help to debug, assume original content (with correct line numbers) is:

.game-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chess-board-container {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999; /* Ensure it's above the board but below the promotion dialog */
}

and two diffs are provided above.

Relevant API Request Output

Additional Context

No response

[mrubens]

Thank you! This seems really important to figure out.

[mrubens]

Cc @hannesrudolph @KJ7LNW

[mrubens]

I tried making a test here but wasn't able to repro. I wonder what the difference is. #2567

[avtc]

I will add a full file content, repro failure can be related to the fact that only part of the file was provided.
filename: GameBoard.razor.css

.game-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chess-board-container {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999; /* Ensure it's above the board but below the promotion dialog */
}

.game-container.promotion-active .chess-board,
.game-container.promotion-active .game-toolbar,
.game-container.promotion-active .game-info-container {
    filter: blur(2px);
    pointer-events: none; /* Disable clicks on these elements */
}

.game-container.promotion-active .promotion-dialog {
    z-index: 1000; /* Ensure it's above the overlay */
    pointer-events: auto; /* Enable clicks on the promotion dialog */
}

[avtc]

@mrubens
Hi, I have updated the full file content just now (in prev.message), and using your test case was able to reproduce the issue.
Thanks for taking attention.

[mrubens]

Awesome, thank you!