Document workspace and folder behavior

Also fixed a type issue.

ci/vscode.patch

@@ -261,7 +261,7 @@ index 2c64061da7..c0ef8faedd 100644
  			// Do nothing. If we can't read the file we have no
  			// language pack config.
 diff --git a/src/vs/code/browser/workbench/workbench.ts b/src/vs/code/browser/workbench/workbench.ts
-index 45f6f17ce0..102289c147 100644
+index 45f6f17ce0..546b4c24de 100644
 --- a/src/vs/code/browser/workbench/workbench.ts
 +++ b/src/vs/code/browser/workbench/workbench.ts
 @@ -16,6 +16,7 @@ import product from 'vs/platform/product/common/product';
@@ -306,14 +306,14 @@ index 45f6f17ce0..102289c147 100644
  	const config: IWorkbenchConstructionOptions & { folderUri?: UriComponents, workspaceUri?: UriComponents } = JSON.parse(configElementAttribute);
  
 +	// Strip the protocol from the authority if it exists.
-+	const normalizeAuthority = (authority?: string): string => authority && authority.replace(/^https?:\/\//, "");
++	const normalizeAuthority = (authority: string): string => authority.replace(/^https?:\/\//, "");
 +	if (config.remoteAuthority) {
 +		(config as any).remoteAuthority = normalizeAuthority(config.remoteAuthority);
 +	}
-+	if (config.workspaceUri) {
++	if (config.workspaceUri && config.workspaceUri.authority) {
 +		config.workspaceUri.authority = normalizeAuthority(config.workspaceUri.authority);
 +	}
-+	if (config.folderUri) {
++	if (config.folderUri && config.folderUri.authority) {
 +		config.folderUri.authority = normalizeAuthority(config.folderUri.authority);
 +	}
 +

doc/FAQ.md

@@ -104,6 +104,15 @@ demand and will work on it when the time is right.
 Use the `--disable-telemetry` flag to completely disable telemetry. We use the
 data collected only to improve code-server.
 
+## How does code-server decide what workspace or folder to open?
+
+code-server tries the following in order:
+
+1. The `workspace` query parameter.
+2. The `folder` query parameter.
+3. The directory passed on the command line.
+4. The last opened workspace or folder.
+
 ## Enterprise
 
 Visit [our enterprise page](https://coder.com) for more information about our