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fix(app): prompt input quirks

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This commit is contained in:
Adam
2026-02-12 19:58:43 -06:00
parent b525c03d20
commit 7f95cc64c5
5 changed files with 87 additions and 15 deletions
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36
packages/app/src/components/prompt-input/editor-dom.test.ts
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@@ -2,17 +2,26 @@ import { describe, expect, test } from "bun:test"
import { createTextFragment, getCursorPosition, getNodeLength, getTextLength, setCursorPosition } from "./editor-dom"
describe("prompt-input editor dom", () => {
test("createTextFragment preserves newlines with br and zero-width placeholders", () => {
test("createTextFragment preserves newlines with consecutive br nodes", () => {
const fragment = createTextFragment("foo\n\nbar")
const container = document.createElement("div")
container.appendChild(fragment)
expect(container.childNodes.length).toBe(5)
expect(container.childNodes.length).toBe(4)
expect(container.childNodes[0]?.textContent).toBe("foo")
expect((container.childNodes[1] as HTMLElement).tagName).toBe("BR")
expect((container.childNodes[2] as HTMLElement).tagName).toBe("BR")
expect(container.childNodes[3]?.textContent).toBe("bar")
})
test("createTextFragment keeps trailing newline as terminal break", () => {
const fragment = createTextFragment("foo\n")
const container = document.createElement("div")
container.appendChild(fragment)
expect(container.childNodes.length).toBe(2)
expect(container.childNodes[0]?.textContent).toBe("foo")
expect((container.childNodes[1] as HTMLElement).tagName).toBe("BR")
expect(container.childNodes[2]?.textContent).toBe("\u200B")
expect((container.childNodes[3] as HTMLElement).tagName).toBe("BR")
expect(container.childNodes[4]?.textContent).toBe("bar")
})
test("length helpers treat breaks as one char and ignore zero-width chars", () => {
@@ -48,4 +57,21 @@ describe("prompt-input editor dom", () => {
container.remove()
})
test("setCursorPosition and getCursorPosition round-trip across blank lines", () => {
const container = document.createElement("div")
container.appendChild(document.createTextNode("a"))
container.appendChild(document.createElement("br"))
container.appendChild(document.createElement("br"))
container.appendChild(document.createTextNode("b"))
document.body.appendChild(container)
setCursorPosition(container, 2)
expect(getCursorPosition(container)).toBe(2)
setCursorPosition(container, 3)
expect(getCursorPosition(container)).toBe(3)
container.remove()
})
})