Commands.Stage() fails with a submodule

Reproduction steps

1. Add a submodule to a Git repository like git submodule add ../test-module test-module
2. Change the commit of the submodule like cd test-module; git checkout -b branch-name
3. Try to stage the submodule using libgit2sharp with Commands.Stage("*") or with Commands.Stage("test-module")

Expected behavior

The submodule change should be staged.

Actual behavior

An exception is thrown because git_index_add_bypath() failed because the path is invalid: test-module/

Commands.Stage() adds a slash at the end of the submodule name it passes to git_index_add_bypath which causes it to fail. git_index_add_bypath works fine passing it test-module directly with repo.Index.Add("test-module") (which is a workaround I'll use for now).

Version of LibGit2Sharp (release number or SHA1)

LibGit2Sharp 0.26.2

Operating system(s) tested; .NET runtime tested

.NET Framework 4.7.2 on Windows 10

從 Commands.Stage 入口點開始，使用 Commands.Stage("*") 和 Commands.Stage("test-module") 重現所述的子模組情況。將其路徑處理與被報告為 workaround 的 repo.Index.Add("test-module") 進行比較。完成標準是能夠在沒有結尾斜線路徑錯誤的情況下暫存已變更的子模組。