Update MD013/line-length default mode to prevent trailing non-whitespace text that begins *just over* the length limit (edge case).

lib/md013.mjs

@@ -64,7 +64,9 @@ export default {
       const inCode = codeBlockLineNumbers.has(lineNumber);
       const inTable = tableLineNumbers.has(lineNumber);
       const maxLength = inCode ? codeLineLength : (isHeading ? headingLineLength : lineLength);
-      const text = (strict || stern) ? line : line.replace(/\S*$/u, "");
+      // If not strict/stern, the last run of non-whitespace is allowed to go
+      // beyond the limit as long as it begins within the limit
+      const text = (strict || stern) ? line : line.replace(/\S*$/u, "#");
       if ((maxLength > 0) &&
           (includeCodeBlocks || !inCode) &&
           (includeTables || !inTable) &&

test/long-lines-thresholds.md

@@ -13,7 +13,7 @@ Text text text text text text text textx text
 
 Text text text text text text text textxe text
 
-{MD013:-2} {MD013:-4}
+{MD013:-2} {MD013:-4} {MD013:-6}
 
 ## Text text text text text te text
 
@@ -25,7 +25,7 @@ Text text text text text text text textxe text
 
 ## Text text text text text textxe text
 
-{MD013:-2} {MD013:-4}
+{MD013:-2} {MD013:-4} {MD013:-6}
 
 ```text
 Text text text te text
@@ -35,7 +35,7 @@ Text text text textx text
 Text text text textxe text
 ```
 
-{MD013:-3} {MD013:-4}
+{MD013:-3} {MD013:-4} {MD013:-5}
 
     Text text tex text
     Text text text text
@@ -43,7 +43,7 @@ Text text text textxe text
     Text text textxe text
     Text text textxet text
 
-{MD013:-2} {MD013:-3}
+{MD013:-2} {MD013:-3} {MD013:-4}
 
 <!-- markdownlint-configure-file {
   "code-block-style": false,

test/snapshots/markdownlint-test-scenarios.mjs.md

@@ -42664,6 +42664,23 @@ Generated by [AVA](https://avajs.dev).
 
     {
       errors: [
+        {
+          errorContext: null,
+          errorDetail: 'Expected: 40; Actual: 44',
+          errorRange: [
+            41,
+            4,
+          ],
+          fixInfo: null,
+          lineNumber: 10,
+          ruleDescription: 'Line length',
+          ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/md013.md',
+          ruleNames: [
+            'MD013',
+            'line-length',
+          ],
+          severity: 'error',
+        },
         {
           errorContext: null,
           errorDetail: 'Expected: 40; Actual: 45',
@@ -42698,6 +42715,23 @@ Generated by [AVA](https://avajs.dev).
           ],
           severity: 'error',
         },
+        {
+          errorContext: null,
+          errorDetail: 'Expected: 33; Actual: 37',
+          errorRange: [
+            34,
+            4,
+          ],
+          fixInfo: null,
+          lineNumber: 22,
+          ruleDescription: 'Line length',
+          ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/md013.md',
+          ruleNames: [
+            'MD013',
+            'line-length',
+          ],
+          severity: 'error',
+        },
         {
           errorContext: null,
           errorDetail: 'Expected: 33; Actual: 38',
@@ -42732,6 +42766,23 @@ Generated by [AVA](https://avajs.dev).
           ],
           severity: 'error',
         },
+        {
+          errorContext: null,
+          errorDetail: 'Expected: 20; Actual: 24',
+          errorRange: [
+            21,
+            4,
+          ],
+          fixInfo: null,
+          lineNumber: 33,
+          ruleDescription: 'Line length',
+          ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/md013.md',
+          ruleNames: [
+            'MD013',
+            'line-length',
+          ],
+          severity: 'error',
+        },
         {
           errorContext: null,
           errorDetail: 'Expected: 20; Actual: 25',
@@ -42766,6 +42817,23 @@ Generated by [AVA](https://avajs.dev).
           ],
           severity: 'error',
         },
+        {
+          errorContext: null,
+          errorDetail: 'Expected: 20; Actual: 24',
+          errorRange: [
+            21,
+            4,
+          ],
+          fixInfo: null,
+          lineNumber: 42,
+          ruleDescription: 'Line length',
+          ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/md013.md',
+          ruleNames: [
+            'MD013',
+            'line-length',
+          ],
+          severity: 'error',
+        },
         {
           errorContext: null,
           errorDetail: 'Expected: 20; Actual: 25',
@@ -42816,7 +42884,7 @@ Generated by [AVA](https://avajs.dev).
       ␊
       Text text text text text text text textxe text␊
       ␊
-      {MD013:-2} {MD013:-4}␊
+      {MD013:-2} {MD013:-4} {MD013:-6}␊
       ␊
       ## Text text text text text te text␊
       ␊
@@ -42828,7 +42896,7 @@ Generated by [AVA](https://avajs.dev).
       ␊
       ## Text text text text text textxe text␊
       ␊
-      {MD013:-2} {MD013:-4}␊
+      {MD013:-2} {MD013:-4} {MD013:-6}␊
       ␊
       \`\`\`text␊
       Text text text te text␊
@@ -42838,7 +42906,7 @@ Generated by [AVA](https://avajs.dev).
       Text text text textxe text␊
       \`\`\`␊
       ␊
-      {MD013:-3} {MD013:-4}␊
+      {MD013:-3} {MD013:-4} {MD013:-5}␊
       ␊
           Text text tex text␊
           Text text text text␊
@@ -42846,7 +42914,7 @@ Generated by [AVA](https://avajs.dev).
           Text text textxe text␊
           Text text textxet text␊
       ␊
-      {MD013:-2} {MD013:-3}␊
+      {MD013:-2} {MD013:-3} {MD013:-4}␊
       ␊
       <!-- markdownlint-configure-file {␊
         "code-block-style": false,␊