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[skip-ci][doc] Add TDirectoryFile::mkdir changes to release notes #20661

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silverweed merged 1 commit into from
Dec 8, 2025
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[skip-ci][doc] Add TDirectoryFile::mkdir changes to release notes #20661

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2 changes: 2 additions & 0 deletions README/ReleaseNotes/v640/index.md
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Expand Up @@ -44,6 +44,8 @@ The following people have contributed to this new version:
## Core Libraries

## I/O
* The behavior or `TDirectoryFile::mkdir` (which is also `TFile::mkdir`) was changed regarding the creation of directory hierarchies: calling `mkdir("a/b/c", "myTitle")` will now assign `myTitle` to the innermost directory `"c"` (before this change it would assign it to `"a"`).
* Fixed a bug in `TDirectoryFile::mkdir` where passing `returnExistingDirectory = true` would not work properly in case of directory hierarchies. The option is now correctly propagated to `mkdir`'s inner invocations.

### TTree

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