fix(multiline-blocks): fix merging of lines to prevent removal of s…

…paces, though removing where needed

README.md

@@ -7282,6 +7282,13 @@ The following patterns are considered problems:
  */
 // "jsdoc/multiline-blocks": ["error"|"warn", {"minimumLengthForMultiline":50,"noMultilineBlocks":true,"noZeroLineText":true}]
 // Message: Should have no text on the "0th" line (after the `/**`).
+
+/**
+ * @lends This can be safely fixed
+ * to a single
+ * line. */
+// "jsdoc/multiline-blocks": ["error"|"warn", {"multilineTags":[],"noMultilineBlocks":true}]
+// Message: Multiline jsdoc blocks are prohibited by your configuration.
 ````
 
 The following patterns are not considered problems:

src/rules/multilineBlocks.js

@@ -174,7 +174,7 @@ export default iterateJsdoc(({
               description: desc, tag: tg, type: typ, name: nme,
               postType, postName, postTag,
             },
-          }, idx, arr) => {
+          }) => {
             if (typ) {
               obj.type = typ;
             }
@@ -189,7 +189,10 @@ export default iterateJsdoc(({
             }
             obj.description += desc;
 
-            if ((obj.name || obj.description) && idx === arr.length - 1) {
+            const nameOrDescription = obj.description || obj.name;
+            if (
+              nameOrDescription && nameOrDescription.slice(-1) !== ' '
+            ) {
               obj.description += ' ';
             }
 

test/rules/assertions/multilineBlocks.js

@@ -447,6 +447,26 @@ export default {
          */
       `,
     },
+    {
+      code: `
+        /**
+         * @lends This can be safely fixed
+         * to a single
+         * line. */
+      `,
+      errors: [{
+        line: 2,
+        message: 'Multiline jsdoc blocks are prohibited by ' +
+                  'your configuration.',
+      }],
+      options: [{
+        multilineTags: [],
+        noMultilineBlocks: true,
+      }],
+      output: `
+        /** @lends This can be safely fixed to a single line. */
+      `,
+    },
   ],
   valid: [
     {