Fix trimming of whitespace when table is wrapped (#7184)

src/System.Management.Automation/FormatAndOutput/common/TableWriter.cs

@@ -294,14 +294,11 @@ namespace Microsoft.PowerShell.Commands.Internal.Format
             System.Span<int> lastColWithContent = screenRows <= OutCommandInner.StackAllocThreshold ? stackalloc int[screenRows] : new int[screenRows];
             for (int row = 0; row < screenRows; row++)
             {
-                for (int col = scArray.Length - 1; col > 0; col--)
+                for (int col = 0; col < scArray.Length; col++)
                 {
-                    int colWidth = _si.columnInfo[validColumnArray[col]].width;
-                    int headerLength = values[col].Length;
-                    if (headerLength / colWidth >= row && headerLength % colWidth > 0)
+                    if (scArray[col].Count > row)
                     {
                         lastColWithContent[row] = col;
-                        break;
                     }
                 }
             }

test/powershell/Modules/Microsoft.PowerShell.Utility/Format-Table.Tests.ps1

@@ -760,4 +760,44 @@ abc abc
             $output = $obj | Format-Table | Out-String
             $output.Replace("`r","").Replace(" ",".").Replace("`n","^") | Should -BeExactly $expectedTable.Replace("`r","").Replace(" ",".").Replace("`n","^")
         }
+
+        It "Should render rows correctly when wrapped: <variation>" -TestCases @(
+            @{ variation = "right"; obj = [pscustomobject] @{A=1;B=2;Name="This`nIs some random`nmultiline content"}; expectedTable = @"
+
+A B Name
+- - ----
+1 2 This
+    Is some random
+    multiline content
+
+
+
+"@ },
+            @{ variation = "left"; obj = [pscustomobject] @{Name="This`nIs some random`nmultiline content";A=1;B=2}; expectedTable = @"
+
+Name                                  A B
+----                                  - -
+This                                  1 2
+Is some random
+multiline content
+
+
+
+"@ },
+            @{ variation = "middle"; obj = [pscustomobject] @{A=1;Name="This`nIs some random`nmultiline content";B=2}; expectedTable = @"
+
+A Name                                  B
+- ----                                  -
+1 This                                  2
+  Is some random
+  multiline content
+
+
+
+"@ }
+        ) {
+            param($obj, $expectedTable)
+            $output = $obj | Format-Table -Wrap | Out-String
+            $output.Replace("`r","").Replace(" ",".").Replace("`n","^") | Should -BeExactly $expectedTable.Replace("`r","").Replace(" ",".").Replace("`n","^")
+        }
     }