TGTextEntry spills text out of the text box on macOS but not on Ubuntu

[zoglauer]

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Description

The problem can easily reproduced with the guitest.C tutorial:
Open Test --> Dialog and enter a long string. Under macOS it will overflow out of the text box (bug), in Linux it will stay contained in the box.

Reproducer

See description.

ROOT version

| Welcome to ROOT 6.36.04 https://root.cern |
| (c) 1995-2025, The ROOT Team; conception: R. Brun, F. Rademakers |
| Built for macosxarm64 on Nov 19 2025, 22:35:48 |
| From tags/6-36-04@6-36-04 |
| With Apple clang version 17.0.0 (clang-1700.4.4.1) |

Installation method

built from source

Operating system

macOS Sequoia, Ubuntu 24.04

Additional context

No response

[couet]

We asked @TimurP (the author of this code) to look at it. He can reproduce the issue and will let us know if he finds something.

[dpiparo]

Thanks @TimurP !