From 2750ff6269a33b31c22c1505fb65fc47bd112f8f Mon Sep 17 00:00:00 2001
From: mbracke <mbracke@antidot.net>
Date: Mon, 5 May 2025 13:29:06 +0200
Subject: [PATCH 1/2] add test for HTML table with colspan 0

---
 .../resources/flexmark_html_converter_spec.md | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/flexmark-html2md-converter/src/test/resources/flexmark_html_converter_spec.md b/flexmark-html2md-converter/src/test/resources/flexmark_html_converter_spec.md
index eff2e6781..0ebe980d4 100644
--- a/flexmark-html2md-converter/src/test/resources/flexmark_html_converter_spec.md
+++ b/flexmark-html2md-converter/src/test/resources/flexmark_html_converter_spec.md
@@ -3010,6 +3010,25 @@ tables with row span cells
 ````````````````````````````````
 
 
+table where some rows end with colspan 0
+
+```````````````````````````````` example Tables: 51
+|   Abc   | Def |
+|---------|-----|
+| no span | span 
+
+.
+<table>
+  <thead>
+    <tr><th>Abc</th><th colspan="1">Def</th></tr>
+  </thead>
+  <tbody>
+    <tr><td>no span</td><td colspan="0">span</td></tr>
+  </tbody>
+</table>
+````````````````````````````````
+
+
 ## Definition Lists
 
 a definition in a block quote

From d9eda5dcf360ce2d8b4c451adeb41b0ac93d00ee Mon Sep 17 00:00:00 2001
From: mbracke <mbracke@antidot.net>
Date: Mon, 5 May 2025 13:23:33 +0200
Subject: [PATCH 2/2] avoid counting table column with span 0 as 0 columns

This fixes a bug where all rows of an HTML table ending with colspan 0
led to index out of bounds exceptions.
---
 .../resources/flexmark_html_converter_spec.md | 19 +++++++++++++++++++
 .../flexmark/util/format/TableRow.java        |  3 ++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/flexmark-html2md-converter/src/test/resources/flexmark_html_converter_spec.md b/flexmark-html2md-converter/src/test/resources/flexmark_html_converter_spec.md
index 0ebe980d4..9537c9910 100644
--- a/flexmark-html2md-converter/src/test/resources/flexmark_html_converter_spec.md
+++ b/flexmark-html2md-converter/src/test/resources/flexmark_html_converter_spec.md
@@ -3029,6 +3029,25 @@ table where some rows end with colspan 0
 ````````````````````````````````
 
 
+table where all rows end with colspan 0
+
+```````````````````````````````` example Tables: 52
+|   Abc   | Def  
+|---------|-----|
+| no span | span 
+
+.
+<table>
+  <thead>
+    <tr><th>Abc</th><th colspan="0">Def</th></tr>
+  </thead>
+  <tbody>
+    <tr><td>no span</td><td colspan="0">span</td></tr>
+  </tbody>
+</table>
+````````````````````````````````
+
+
 ## Definition Lists
 
 a definition in a block quote
diff --git a/flexmark-util-format/src/main/java/com/vladsch/flexmark/util/format/TableRow.java b/flexmark-util-format/src/main/java/com/vladsch/flexmark/util/format/TableRow.java
index 6a6d7f4bd..00d6ae114 100644
--- a/flexmark-util-format/src/main/java/com/vladsch/flexmark/util/format/TableRow.java
+++ b/flexmark-util-format/src/main/java/com/vladsch/flexmark/util/format/TableRow.java
@@ -6,6 +6,7 @@
 import java.util.List;
 
 import static com.vladsch.flexmark.util.format.TableCellManipulator.BREAK;
+import static com.vladsch.flexmark.util.misc.Utils.max;
 import static com.vladsch.flexmark.util.misc.Utils.maxLimit;
 import static com.vladsch.flexmark.util.misc.Utils.minLimit;
 
@@ -97,7 +98,7 @@ public int getSpannedColumns() {
         int columns = 0;
         for (TableCell cell : cells) {
             if (cell == null) continue;
-            columns += cell.columnSpan;
+            columns += max(cell.columnSpan, 1);
         }
         return columns;
     }