Indent on enter after line continuations (#3915)

For #3284.

Author: jakebailey

news/1 Enhancements/3284.md

@@ -0,0 +1 @@
+Indent on enter after line continuations.

src/client/extension.ts

@@ -162,6 +162,10 @@ export async function activate(context: ExtensionContext): Promise<IExtensionApi
                 beforeText: /^\s*(?:def|class|for|if|elif|else|while|try|with|finally|except|async)\b.*:\s*/,
                 action: { indentAction: IndentAction.Indent }
             },
+            {
+                beforeText: /^(?!\s+\\)[^#\n]+\\\s*/,
+                action: { indentAction: IndentAction.Indent }
+            },
             {
                 beforeText: /^\s*#.*/,
                 afterText: /.+$/,