[BUG] Reduce margins of dialog before showing horizontal scroll bar

[atextor]

How: List of performed steps
Open a dialog, e.g. "Settings", resize window

What: Actual result vs expected result

On full screen width the dialog is shown as it's intended to look like:

But when I reduce my window size, dialog display is broken:

Expected:
The dialog is kept centered, when I reduce horizontal window size, the margins left and right of the dialog disappear but the dialog is still completely shown

Actual:
The margins are kept and a horizontal scrollbar is shown inside the dialog:

Even the closing X button is invisible and needs to be scrolled in.

Where: (e.g. component, version, url, your system info)
AME 5.5.0 on Linux