[css-overfow-4] Run white-space proc. phase 2 before ellipsis insertion

See #12008

Author: frivoal

css-overflow-4/Overview.bs

@@ -810,7 +810,9 @@ Indicating Block-Axis Overflow: the 'block-ellipsis' property</h3>
 	and ''line-height: 0''
 	and is placed in the line box after the last
 	<a>soft wrap opportunity</a> (see [[!CSS-TEXT-3]])
-	that would still allow the entire <a>block overflow ellipsis</a> to fit on the line.
+	that would still allow the entire <a>block overflow ellipsis</a> to fit on the line,
+	applying [[css-text-4#white-space-rules]] including [[css-text-4#white-space-phase-2]]
+	before inserting the [=block overflow ellipsis=].
 	For this purpose, <a>soft wrap opportunities</a> added by 'overflow-wrap' are ignored,
 	as are those inhibited by ''text-wrap-mode: nowrap''.
 	If this results in the entire contents of the line box being displaced,