fix: ignore trimmed empty spans

Author: lihbr

src/lib/hastToRichText.ts

@@ -157,7 +157,7 @@ export const hastToRichText = (
 						case RichTextNodeType.em:
 						case RichTextNodeType.label:
 						case RichTextNodeType.hyperlink: {
-							const length = toString(node).length;
+							const length = toString(node).trimEnd().length;
 
 							try {
 								builder.appendSpan(shorthandOrNode, length);
@@ -238,7 +238,7 @@ export const hastToRichText = (
 					case RichTextNodeType.label:
 					case RichTextNodeType.hyperlink: {
 						const span = serializeSpan(node, match);
-						const length = toString(node).length;
+						const length = toString(node).trimEnd().length;
 
 						try {
 							builder.appendSpan(span, length);

test/__snapshots__/helpers-unstable_htmlAsRichText.test.ts.snap

@@ -1001,7 +1001,7 @@ exports[`transforms HTML to rich text > spans > empty spans 1`] = `
   {
     "direction": "ltr",
     "spans": [],
-    "text": "lorem ipsum dolor sit amet",
+    "text": "lorem ipsum dolorsit amet",
     "type": "paragraph",
   },
 ]

test/helpers-unstable_htmlAsRichText.test.ts

@@ -47,7 +47,9 @@ describe("transforms HTML to rich text", () => {
 		});
 
 		testHTMLAsRichTextHelper("empty spans", {
-			input: /* html */ `<p>lorem <strong></strong>ipsum dolor sit amet</p>`,
+			// It's normal for `dolor` and `sit` to be concatenated here.
+			// That how the browser would render it.
+			input: /* html */ `<p>lorem <strong></strong>ipsum dolor<em> </em>sit amet</p>`,
 			expectHTMLToMatchInputExactly: false,
 		});