[FEATURE]: Restrict formatting only to the edited range for clang-format (and Prettier)

[micuintus]

Range-Based Code Formatting Enhancement

Overview

Implemented intelligent range-based formatting that only formats edited code sections, preventing unrelated formatting changes from cluttering diffs when using the Edit tool.

[rekram1-node]

@micuintus you can do this already:

{
  "$schema": "https://opencode.ai/config.json",
  "formatter": false,
}

[micuintus]

@rekram1-node But that means formatting is disabled globally? I cannot tell my LLM in the same session to skip formatting as I could with 6e2d694?

[rekram1-node]

I guess I see what u mean, kinda hesitant to be adding things to edit tool tho

[micuintus]

@rekram1-node

I guess I see what u mean, kinda hesitant to be adding things to edit tool tho

Gotcha!

I went back to the drawing board and realised: What I actually want is not to discard the formatting, but restrict the auto-formatting to only the sections of the file that were changed.

1. I updated this issue's description and the PR feat(formater): restrict formatting to only the changed range of a file.  #4604
2. Seems be working like a charm (no pun intended :P)
3. For me it resolves a VERY annoying issue, which rendered OpenCode unusable in these use cases (1000 of formatting changes)