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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Indicate continuation and truncation with ASCII characters without
 disabling fringes
Date: Wed, 15 May 2024 14:35:49 +0300
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> From: Emre Yolcu <mail@emreyolcu.com>
> Date: Wed, 15 May 2024 01:04:44 -0400
> 
> When fringes are not available, Emacs falls back to using the leftmost 
> and rightmost character cells to indicate line continuation and 
> truncation with ASCII characters. Is there an easy (i.e., Elisp) way to 
> force this fallback behavior when fringes are enabled?

No.  The logic you describe is hard-coded in the display engine, such
that the truncation/continuation glyphs are shown only if the width of
the corresponding fringe is zero.  There's no way currently to affect
this logic.