extracted mergeTextNodes from collapseWhitespace

lib/single-file/htmlnano.js

@@ -121,7 +121,7 @@ this.htmlnano = this.htmlnano || (() => {
 		}
 	};
 
-	const modules = [collapseBooleanAttributes, collapseWhitespace, removeComments, removeEmptyAttributes, removeRedundantAttributes];
+	const modules = [collapseBooleanAttributes, mergeTextNodes, collapseWhitespace, removeComments, removeEmptyAttributes, removeRedundantAttributes];
 
 	return {
 		process: doc => {
@@ -148,13 +148,17 @@ this.htmlnano = this.htmlnano || (() => {
 		}
 	}
 
-	/** Collapses redundant whitespaces */
-	function collapseWhitespace(node) {
+	function mergeTextNodes(node) {
 		if (node.nodeType == Node.TEXT_NODE) {
 			if (node.previousSibling && node.previousSibling.nodeType == Node.TEXT_NODE) {
 				node.textContent = node.previousSibling.textContent + node.textContent;
 				node.previousSibling.remove();
 			}
+		}
+	}
+
+	function collapseWhitespace(node) {
+		if (node.nodeType == Node.TEXT_NODE) {
 			let element = node.parentElement;
 			let textContent = node.textContent;
 			while (noWhitespaceCollapse(element)) {
@@ -175,14 +179,12 @@ this.htmlnano = this.htmlnano || (() => {
 		return element && !noWhitespaceCollapseElements.includes(element.tagName.toLowerCase());
 	}
 
-	/** Removes HTML comments */
 	function removeComments(node) {
 		if (node.nodeType == Node.COMMENT_NODE) {
 			return !node.textContent.toLowerCase().trim().startsWith("[if");
 		}
 	}
 
-	/** Removes empty attributes */
 	function removeEmptyAttributes(node) {
 		if (node.nodeType == Node.ELEMENT_NODE) {
 			node.getAttributeNames().forEach(attributeName => {
@@ -196,7 +198,6 @@ this.htmlnano = this.htmlnano || (() => {
 		}
 	}
 
-	/** Removes redundant attributes */
 	function removeRedundantAttributes(node) {
 		if (node.nodeType == Node.ELEMENT_NODE) {
 			const tagRedundantAttributes = redundantAttributes[node.tagName.toLowerCase()];