[lexical-playground] Bug Fix: row height resizing for merged cells

[kirandash]

Description

Current behavior:

• Row height resizing doesn't work correctly after merging cells
• The height style is applied to the wrong row when resizing merged cells

Changes being added:

• Fixed row height calculation logic in TableCellResizer plugin to properly handle merged cells:
  1. Added detection of full row merges by checking tableCellNode.getColSpan() === tableNode.getColumnCount()
  2. Updated row index calculation to apply height to:
     • First row (baseRowIndex) for full row merges
     • Last row (baseRowIndex + rowSpan - 1) for partial merges
• Simplified height calculation logic to use direct cell heights
• Added E2E test "Resize row with merged cells spanning multiple rows" to verify the behavior

Closes #7304

Test plan

Before

• Insert a table
• Merge cells (full row)
• Try to resize the row height using the bottom resizer
• Height adjustment is not applied

lexical-7304-bug.mov

After

• Insert a table
• Test full row merge:
  • Merge entire row and verify height adjustment is applied to the first row
  • Height resizing works as expected
• All existing table tests passThis fixes the issue where resizing row heights doesn't work correctly
  after merging cells. The fix handles two scenarios:
• Partial cell merges: height is applied to the last row
• Full row merges: height is applied to the first row

lexical-7304-fix.mov

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 7, 2025 1:19pm
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 7, 2025 1:19pm

[etrepum]

Works great! Nice job