Fix long crash stack traces breaking the GitHub URL

frontend/src/io-managers/panic.ts

@@ -23,6 +23,7 @@ export function createPanicManager(editor: Editor, dialogState: DialogState) {
 export function githubUrl(panicDetails: string): string {
 	const url = new URL("https://github.com/GraphiteEditor/Graphite/issues/new");
 
+	const buildUrl = (includeCrashReport: boolean) => {
 		let body = stripIndents`
 			**Describe the Crash**
 			Explain clearly what you were doing when the crash occurred.
@@ -45,8 +46,12 @@ export function githubUrl(panicDetails: string): string {
 			Copied from the crash dialog in the Graphite editor:
 		`;
 
+		const manualCopyStackTraceNotice = stripIndents`
+			Before submitting this bug, REPLACE THIS WITH THE LOG. Return to the editor and click "Copy Error Log" in the crash dialog and paste it in place of this text.
+		`;
+
 		body += "\n\n```\n";
-	body += panicDetails.trimEnd();
+		body += includeCrashReport ? panicDetails.trimEnd() : manualCopyStackTraceNotice;
 		body += "\n```";
 
 		const fields = {
@@ -64,4 +69,12 @@ export function githubUrl(panicDetails: string): string {
 		});
 
 		return url.toString();
+	};
+
+	let urlString = buildUrl(true);
+	if (urlString.length >= 8192) {
+		// Fall back to a shorter version if it exceeds GitHub limits of 8192 total characters
+		urlString = buildUrl(false);
+	}
+	return urlString;
 }