Exec task trims leading whitespace in ConsoleToMsBuild

[rainersigwald]

Given leading.txt

line with no leading whitespace
    line with some leading whitespace

and a project that transforms it into Exec stdout:

<Project>
    <Target Name="Go">
        <Exec Command="type leading.txt"
              StandardOutputImportance="low"
              ConsoleToMsBuild="true">
            <Output TaskParameter="ConsoleOutput" ItemName="ConOut" />
        </Exec>

        <Message Importance="high" Text="--interactive @(ConOut)" />
    </Target>
</Project>

Exec is trimming leading whitespace

❯ msbuild -bl
MSBuild version 17.10.0-preview-24067-01+f1448f158 for .NET Framework
--interactive line with no leading whitespace;line with some leading whitespace

Build succeeded in 0.1s

[KalleOlaviNiemitalo]

msbuild/src/Tasks/Exec.cs

Lines 411 to 413 in 195e7f5

	if (ConsoleToMSBuild)
	{
	string trimmedTextLine = singleLine.Trim();

This reminds me that ReadLinesFromFile likewise trims spaces. I had attempted to use ReadLinesFromFile, ItemGroup, and WriteLinesToFile to remove a particular line from a Visual Studio sln file, but the loss of indentation made the result invalid.

msbuild/src/Tasks/FileIO/ReadLinesFromFile.cs

Line 56 in 195e7f5

string trimmedTextLine = textLine.Trim(charsToTrim);

[yuehuang010]

Can you double check if putting them into an item would Trim too?

<ItemGroup>
<Text Include="   file.cs" />
<Text Include="file1.cs" />
</ItemGroup>