Fix 'Jitter Points' and 'Sample Polylines' working incorrectly with X or Y scale of 0 content (#3984)

* Fix NaN points produced by Sample Polylines on 0-scaled input

* Fix Jitter Points inverse transform for zero-scale axes and stop resetting stroke transform

* Remove a couple confusing Debug nodes

* Fix edge case

* Update demo art

* Fix order change in Jitter Points causing different results from earlier

* Fix bug in bisect tool

* Break out functionality into helper functions

website/static/js/page/contributor-guide/bisect-tool.js

@@ -214,6 +214,36 @@ document.addEventListener("DOMContentLoaded", () => {
 		commits = fetched;
 	}
 
+	async function extendCommitsForward() {
+		if (commits.length === 0) return false;
+
+		const newest = commits[commits.length - 1];
+		const since = new Date(newest.date.getTime() + 1000).toISOString();
+
+		let /** @type {any[]} */ allRaw = [];
+		let page = 1;
+
+		while (true) {
+			const raw = await fetchCommitList(since, undefined, page);
+			if (!raw || raw.length === 0) break;
+			allRaw = allRaw.concat(raw);
+			if (raw.length < 100) break;
+			page++;
+		}
+
+		if (allRaw.length === 0) return false;
+
+		let fetched = parseCommits(allRaw);
+		fetched.reverse();
+
+		const existingShas = new Set(commits.map((c) => c.sha));
+		fetched = fetched.filter((c) => !existingShas.has(c.sha));
+		if (fetched.length === 0) return false;
+
+		commits = [...commits, ...fetched];
+		return true;
+	}
+
 	async function extendCommitsBackward() {
 		if (commits.length === 0) return false;
 
@@ -340,8 +370,9 @@ document.addEventListener("DOMContentLoaded", () => {
 				badIndex = currentIndex;
 				boundarySearching = true;
 			} else {
-				// Absent at starting commit. The newest commit should have it (user assumes master has it).
+				// Absent at starting commit, so the issue was introduced more recently. Extend the commit list forward (towards HEAD) before narrowing.
 				goodIndex = currentIndex;
+				await extendCommitsForward();
 				badIndex = commits.length - 1;
 				bisectPhase = "binary";
 			}