From 80a48cef2745f4a424cb87272a1e5b8f0b2556de Mon Sep 17 00:00:00 2001
From: Daniel <danielglezalbo@gmail.com>
Date: Sat, 6 Dec 2025 23:06:49 +0100
Subject: [PATCH] fix: support multiline

---
 .../IronCalc/src/components/Workbook/Workbook.tsx | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/webapp/IronCalc/src/components/Workbook/Workbook.tsx b/webapp/IronCalc/src/components/Workbook/Workbook.tsx
index 7829649..31c9e7d 100644
--- a/webapp/IronCalc/src/components/Workbook/Workbook.tsx
+++ b/webapp/IronCalc/src/components/Workbook/Workbook.tsx
@@ -154,34 +154,43 @@ const Workbook = (props: { model: Model; workbookState: WorkbookState }) => {
       row: number;
       oldFontSize: number;
       oldRowHeight: number;
+      maxLineCount: number;
     }> = [];
 
     for (let row = actualRowStart; row <= actualRowEnd; row++) {
       let maxFontSize = 0;
+      let maxLineCount = 1;
       for (let col = actualColumnStart; col <= actualColumnEnd; col++) {
         const style = model.getCellStyle(sheet, row, col);
         maxFontSize = Math.max(maxFontSize, style.font.sz);
+
+        // Count lines in cell content (we add new lines with Alt+Enter / Option+Enter)
+        const cellContent = model.getCellContent(sheet, row, col);
+        const lineCount = cellContent.split("\n").length;
+        maxLineCount = Math.max(maxLineCount, lineCount);
       }
       const oldRowHeight = model.getRowHeight(sheet, row);
       rowData.push({
         row,
         oldFontSize: maxFontSize,
         oldRowHeight,
+        maxLineCount,
       });
     }
 
     /** Update the font size in the model */
     updateRangeStyle("font.size_delta", `${delta}`);
 
-    /** Adjust row heights based on the new font sizes */
-    for (const { row, oldFontSize, oldRowHeight } of rowData) {
+    /** Adjust row heights based on the new font sizes and line counts */
+    for (const { row, oldFontSize, oldRowHeight, maxLineCount } of rowData) {
       const newFontSize = oldFontSize + delta;
 
       if (oldRowHeight < DEFAULT_ROW_HEIGHT) {
         continue;
       }
 
-      const requiredHeight = 8 + newFontSize;
+      const lineHeight = newFontSize * 1.5;
+      const requiredHeight = (maxLineCount - 1) * lineHeight + 8 + newFontSize;
 
       let newRowHeight: number;
       if (requiredHeight > DEFAULT_ROW_HEIGHT) {