Dialog renders too small on first open; buttons not visible

[bonifertcs]

Environment

• macOS 15.7.1
• PDF Split And Merge Basic 5.4.0
• OpenJDK Runtime Environment 21.0.8+12-LTS
• Vendor: BellSoft
• Java runtime path: /Applications/PDFsam Basic.app/Contents/runtime/Contents/Home
• JavaFX runtime version: 23.0.2+3
• Max memory 12 GB
• display: external 4K monitor; issue reproduces with both HiDPI (scaled) and standard resolution modes

Steps to Reproduce

1. Launch PDFsam 5.4.0 on macOS 15.7.1.
2. Invoke a function that opens a dialog, e.g. Split. (Happens with other functions as well.)
3. Observe the dialog the first time it appears in the session.

Actual Result

• The dialog is rendered at an incorrectly small size on first display.
• The action buttons (e.g., Owerwrite, Rename, Skip, Cancel) are not visible / fall outside the window bounds.

Expected Result

• The dialog should render at the correct size on first display, with all buttons visible.

Workaround

• Press Esc to dismiss the undersized dialog, then run the function again.
• On the second open, the dialog has the correct size and the buttons are visible.

Notes

• The behavior is the same regardless of display mode (HiDPI vs. standard).
• Reproducible every time after a fresh app launch.

[guy-teube]

Same in Ubuntu version (5.4.0 too), except close and reopen doesn't work.
My workaround is to navigate blindy with Tabs key, then press Enter to valid the action.
The window with buttons should be resizable (and positions reminderable).

[Chapoly1305]

Same.