fix(vscode): keep diff identifiers intact

.changeset/keep-diff-identifiers-intact.md

@@ -0,0 +1,5 @@
+---
+"kilo-code": patch
+---
+
+Keep changed identifiers intact when highlighting edits within diff lines.

packages/kilo-ui/src/pierre/index.test.ts

@@ -2,8 +2,8 @@ import { describe, expect, test } from "bun:test"
 import { createDefaultOptions } from "./index"
 
 describe("Pierre diff options", () => {
-  test("highlights changed characters in unified and split diffs", () => {
-    expect(createDefaultOptions("unified").lineDiffType).toBe("char")
-    expect(createDefaultOptions("split").lineDiffType).toBe("char")
+  test("keeps changed identifiers intact in unified and split diffs", () => {
+    expect(createDefaultOptions("unified").lineDiffType).toBe("word-alt")
+    expect(createDefaultOptions("split").lineDiffType).toBe("word-alt")
   })
 })

packages/kilo-ui/src/pierre/index.ts

@@ -10,7 +10,9 @@ import { createDefaultOptions as defaults, styleVariables } from "@opencode-ai/u
 
 export { styleVariables }
 
-export const LINE_DIFF_TYPE = "char" as const
+// Character matching fragments inserted identifiers when they share letters with
+// existing symbols. Word-alt keeps those logical additions visually intact.
+export const LINE_DIFF_TYPE = "word-alt" as const
 
 // Pierre 1.1 treats its changed-line override properties as tint targets. Apply
 // Kilo semantic surfaces at the computed row level so host diff colors stay final.