[FIX] Bundler: Ensure reproducibility for bundles with multiple parts

Sort modules in preload sections alphabetically.
This caused different bundle contents based on the order of modules that
the resolver provides, which is not deterministic.

Remove terser from size estimation as modules are now already optimized
if the 'optimize' bundle option is enabled.
This caused incorrect estimations about the bundle size which resulted
into size differences of the individual parts.

lib/lbt/bundle/AutoSplitter.js

@@ -1,6 +1,5 @@
 "use strict";
 
-const terser = require("terser");
 const {pd} = require("pretty-data");
 
 const ModuleName = require("../utils/ModuleName");
@@ -112,6 +111,7 @@ class AutoSplitter {
 
 		resolvedModule.sections.forEach( (section) => {
 			let currentSection;
+			let sequence;
 			switch ( section.mode ) {
 			case SectionType.Provided:
 				// 'provided' sections are no longer needed in a fully resolved module
@@ -131,16 +131,20 @@ class AutoSplitter {
 				});
 				break;
 			case SectionType.Preload:
+				sequence = section.modules.slice();
+				// simple version: just sort alphabetically
+				sequence.sort();
+
 				// NODE_TODO: sort by copyright:
-				// sequence = section.modules.slice();
 				// jsBuilder.beforeWriteFunctionPreloadSection((List<ModuleName>) sequence);
+
 				currentSection = {
 					mode: SectionType.Preload,
 					filters: []
 				};
 				currentSection.name = section.name;
 				currentModule.sections.push( currentSection );
-				section.modules.forEach( (module) => {
+				sequence.forEach( (module) => {
 					const moduleSize = moduleSizes[module];
 					if ( part + 1 < numberOfParts && totalSize + moduleSize / 2 > partSize ) {
 						part++;
@@ -195,26 +199,9 @@ class AutoSplitter {
 			}
 
 			if ( /\.js$/.test(module) ) {
-				// console.log("determining compressed size for %s", module);
-				let fileContent = await resource.buffer();
-				if ( this.optimize ) {
-					// console.log("uglify %s start", module);
-					const result = await terser.minify({
-						[resource.name]: String(fileContent)
-					}, {
-						warnings: false, // TODO configure?
-						compress: false, // TODO configure?
-						output: {
-							comments: copyrightCommentsPattern,
-							wrap_func_args: false
-						}
-						// , outFileName: resource.name
-						// , outSourceMap: true
-					});
-					// console.log("uglify %s end", module);
-					fileContent = result.code;
-				}
-				// trace.debug("analyzed %s:%d%n", module, mw.getTargetLength());
+				// No optimize / minify step here as the input should be
+				// either already optimized or not, based on the bundle options
+				const fileContent = await resource.buffer();
 				return fileContent.length;
 			} else if ( /\.properties$/.test(module) ) {
 				/* NODE-TODO minimize *.properties