Checkpoint web parity through Chromium input tasks

web/tests/unit/input-modal.test.mjs

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+import assert from "node:assert/strict";
+import fs from "node:fs";
+import path from "node:path";
+import test from "node:test";
+import ts from "../../node_modules/typescript/lib/typescript.js";
+
+const root = path.resolve(import.meta.dirname, "../../..");
+const sourcePath = path.join(root, "web/protocol/input-modal.ts");
+const output = ts.transpileModule(fs.readFileSync(sourcePath, "utf8"), { compilerOptions: { module: ts.ModuleKind.ES2022, target: ts.ScriptTarget.ES2022 }, fileName: sourcePath, reportDiagnostics: true });
+assert.deepEqual(output.diagnostics, []);
+const modal = await import(`data:text/javascript;base64,${Buffer.from(output.outputText).toString("base64")}`);
+
+test("M14-04F cancels touch modal without commit and starts one two-finger navigation revision", () => {
+  let state = modal.createInputModalState();
+  state = modal.beginTouch(state, 4);
+  state = modal.beginTouch(state, 2);
+  assert.deepEqual([state.kind, state.activePointerIds, state.navigationRevision, state.mainCommitCount], ["TOUCH_NAVIGATION", [2, 4], 1, 0]);
+  state = modal.cancelInputModal(state);
+  assert.deepEqual([state.kind, state.activePointerIds, state.cancelled, state.mainCommitCount], ["NONE", [], true, 0]);
+});
+
+test("M14-04F commits pen stroke once and ignores late up/cancel", () => {
+  let state = modal.beginPenStroke(modal.createInputModalState(), 9);
+  state = modal.commitPenStroke(state, 9);
+  state = modal.commitPenStroke(state, 9);
+  assert.deepEqual([state.kind, state.mainCommitCount, state.activePointerIds], ["NONE", 1, []]);
+});