fix(termdebug): evaluate display with gdb pretty print #39453

Calling `set print pretty on` in GDB will:

> Cause GDB to print structures in an indented format with one member
per line

However, `termdebug` just renders the newlines as raw `\n` characters.
This is a regression of[1]. Glancing through the history it looks to
have been caused by cd1b14f027f375a9de17fdf106016470f52035f7 which
removed the output splitting when displaying the eval results, so this
changes adds that behaviour back.

As a quick reproduction/test, compile the following C program:

```c

struct Foo {
    char *name;
};

int main(void) {
    struct Foo f = {"hello"};
    printf("%s\n", f.name);

    return 0;
}
```

Then launch `nvim` and run:

    :Termdebug main
    :Gdb
    (gdb) set print pretty on
    (gdb) break main
    (gdb) run
    :Source

Place the cursor on the `f` variable and call `:Evaluate`. Before this change:

![](https://github.com/user-attachments/assets/51318e1e-9cdd-43ab-aa35-4aaad1d9f65f)

With this change:

![](https://github.com/user-attachments/assets/33874679-21b4-4d07-98ef-c2c9e9d19dd6)

Link: https://github.com/neovim/neovim/issues/10020 [1]

0 files changed, 0 insertions, 0 deletions