Introduce a claim_space helper

This brings the hydration `claim` code more in-line with what the
`create` code does.

src/compiler/compile/render_dom/wrappers/Text.ts

@@ -66,11 +66,12 @@ export default class TextWrapper extends Wrapper {
 
 	render(block: Block, parent_node: string, parent_nodes: string) {
 		if (this.skip) return;
+		const use_space = this.use_space();
 
 		block.add_element(
 			this.var,
-			this.use_space() ? `@space()` : `@text(${stringify(this.data)})`,
-			parent_nodes && `@claim_text(${parent_nodes}, ${stringify(this.data)})`,
+			use_space ? `@space()` : `@text(${stringify(this.data)})`,
+			parent_nodes && (use_space ? `@claim_space(${parent_nodes})` : `@claim_text(${parent_nodes}, ${stringify(this.data)})`),
 			parent_node
 		);
 	}

src/runtime/internal/dom.ts

@@ -164,6 +164,10 @@ export function claim_text(nodes, data) {
 	return text(data);
 }
 
+export function claim_space(nodes) {
+	return claim_text(nodes, ' ');
+}
+
 export function set_data(text, data) {
 	data = '' + data;
 	if (text.data !== data) text.data = data;