Merge pull request webpack#7696 from webpack/bugfix/max-size-reasons

copy chunk reason to maxSize parts

Author: sokra

lib/optimize/SplitChunksPlugin.js

@@ -831,6 +831,7 @@ module.exports = class SplitChunksPlugin {
 							if (i !== results.length - 1) {
 								newPart = compilation.addChunk(name);
 								chunk.split(newPart);
+								newPart.chunkReason = chunk.chunkReason;
 								// Add all modules to the new chunk
 								for (const module of group.items) {
 									if (typeof module.chunkCondition === "function") {

test/__snapshots__/StatsTestCases.test.js.snap

@@ -2841,7 +2841,7 @@ exports[`StatsTestCases should print correct stats for split-chunks-max-size 1`]
     chunk   {11} prod-main~cd7c5bfc.js (main~cd7c5bfc) 1.57 KiB ={0}= ={1}= ={2}= ={3}= ={4}= ={5}= ={6}= ={7}= ={8}= ={9}= ={10}= ={12}= [initial] [rendered]
         > ./ main
      [13] ./very-big.js?3 1.57 KiB {11} [built]
-    chunk   {12} prod-vendors~main~7274e1de.js (vendors~main~7274e1de) 402 bytes ={0}= ={1}= ={2}= ={3}= ={4}= ={5}= ={6}= ={7}= ={8}= ={9}= ={10}= ={11}= [initial] [rendered]
+    chunk   {12} prod-vendors~main~7274e1de.js (vendors~main~7274e1de) 402 bytes ={0}= ={1}= ={2}= ={3}= ={4}= ={5}= ={6}= ={7}= ={8}= ={9}= ={10}= ={11}= [initial] [rendered] split chunk (cache group: vendors) (name: vendors~main)
         > ./ main
      [40] ./node_modules/big.js?1 268 bytes {12} [built]
      [41] ./node_modules/small.js?1 67 bytes {12} [built]
@@ -2911,7 +2911,7 @@ Child development:
     chunk {main~._very-big.js~62f7f644} dev-main~._very-big.js~62f7f644.js (main~._very-big.js~62f7f644) 1.57 KiB ={main~._big.js~1}= ={main~._in-some-directory_b}= ={main~._in-some-directory_very-big.js~8d76cf03}= ={main~._index.js~41f5a26e}= ={main~._inner-module_small.js~3}= ={main~._small.js~1}= ={main~._subfolder_big.js~b}= ={main~._subfolder_small.js~1}= ={main~._very-big.js~08cf55cf}= ={main~._very-big.js~4647fb9d}= ={vendors~main~._node_modules_b}= ={vendors~main~._node_modules_very-big.js~6bdbed7b}= [entry] [rendered]
         > ./ main
      [./very-big.js?1] 1.57 KiB {main~._very-big.js~62f7f644} [built]
-    chunk {vendors~main~._node_modules_b} dev-vendors~main~._node_modules_b.js (vendors~main~._node_modules_b) 402 bytes ={main~._big.js~1}= ={main~._in-some-directory_b}= ={main~._in-some-directory_very-big.js~8d76cf03}= ={main~._index.js~41f5a26e}= ={main~._inner-module_small.js~3}= ={main~._small.js~1}= ={main~._subfolder_big.js~b}= ={main~._subfolder_small.js~1}= ={main~._very-big.js~08cf55cf}= ={main~._very-big.js~4647fb9d}= ={main~._very-big.js~62f7f644}= ={vendors~main~._node_modules_very-big.js~6bdbed7b}= [initial] [rendered]
+    chunk {vendors~main~._node_modules_b} dev-vendors~main~._node_modules_b.js (vendors~main~._node_modules_b) 402 bytes ={main~._big.js~1}= ={main~._in-some-directory_b}= ={main~._in-some-directory_very-big.js~8d76cf03}= ={main~._index.js~41f5a26e}= ={main~._inner-module_small.js~3}= ={main~._small.js~1}= ={main~._subfolder_big.js~b}= ={main~._subfolder_small.js~1}= ={main~._very-big.js~08cf55cf}= ={main~._very-big.js~4647fb9d}= ={main~._very-big.js~62f7f644}= ={vendors~main~._node_modules_very-big.js~6bdbed7b}= [initial] [rendered] split chunk (cache group: vendors) (name: vendors~main)
         > ./ main
      [./node_modules/big.js?1] 268 bytes {vendors~main~._node_modules_b} [built]
      [./node_modules/small.js?1] 67 bytes {vendors~main~._node_modules_b} [built]