After applying patches 9.2.450 to 9.2.452, I get the following
warnings in Normal and Huge (but not in Tiny with or without GUI).
Build is not halted but proceeds to Link.

In function ‘popup_blend_with_base’,
   inlined from ‘screen_line’ at screen.c:772:26:
screen.c:512:28: warning: ‘po.popup_attr’ may be used uninitialized
[-Wmaybe-uninitialized]
 512 |     int         combined = hl_combine_attr(po->popup_attr, char_attr);
     |                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
screen.c: In function ‘screen_line’:
screen.c:608:21: note: ‘po.popup_attr’ was declared here
 608 |     popup_opacity_T po;                 // cached when drawing
an opacity popup
     |                     ^~
In function ‘popup_blend_with_base’,
   inlined from ‘screen_line’ at screen.c:772:26:
screen.c:514:12: warning: ‘po.blend’ may be used uninitialized
[-Wmaybe-uninitialized]
 514 |     return hl_blend_attr(base_attr, combined, po->blend, blend_fg);
     |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
screen.c: In function ‘screen_line’:
screen.c:608:21: note: ‘po.blend’ was declared here
 608 |     popup_opacity_T po;                 // cached when drawing
an opacity popup
     |                     ^~

Best regards,
Tony.

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