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I only have Ubuntu 25.04 not 26.04 installed right now, so the testing environment may be different; I do not have the disk space to upgrade.
[EDIT—tested on Ubuntu 26.04 with same result]
But when I run the Divider example on this branch, the textboxes seem compressed in GTK4 + adwaita:
But not in GTK3:
This may or may not be a preexisting issue in which case we could file it separately, but if the fix is small perhaps it may be viable to stuff it in this PR.
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Are there any other platforms that may benefit from this check? I think WinForms might, especially when someone runs the testbed on HiDPI screens, because the Divider rehint code there may be easy to mess up if we use the wrong rounding.
Implement GTK4 Divider sizing for both orientations and enable its testbed coverage. The direction-change checks now verify visible thickness and wait for native geometry updates.
Refs #3069.
Validated with the Divider testbed suite on GTK3, GTK4, and GTK4 with libadwaita (4 passed each) on Ubuntu 26.04 ARM64. Pre-commit, docs lint, and core/Travertino tests passed with 100% coverage.
PR Checklist:
Assisted-by: OpenAI Codex (GPT-6)