bug#38705: 26.3; set-frame-size pixelwise makes frame larger

[ynyaaa@gmail.com]

set-frame-size with PIXELWISE=t makes frame larger than specified value.
(setq frame-resize-pixelwise t) makes no difference.

(progn (set-frame-size nil 500 500 t)
       (list (list (frame-outer-width)
                   (frame-pixel-width)
                   (frame-inner-width))
             (list (frame-outer-height)
                   (frame-pixel-height)
                   (frame-inner-height))))
=>((549 533 533) (595 536 536))

(progn (set-frame-size nil 1000 1000 t)
       (list (list (frame-outer-width)
                   (frame-pixel-width)
                   (frame-inner-width))
             (list (frame-outer-height)
                   (frame-pixel-height)
                   (frame-inner-height))))
=>((1049 1033 1033) (1095 1036 1036))



In GNU Emacs 26.3 (build 1, x86_64-w64-mingw32)
 of 2019-08-29 built on CIRROCUMULUS
Repository revision: 96dd0196c28bc36779584e47fffcca433c9309cd
Windowing system distributor 'Microsoft Corp.', version 6.3.9600
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