show-paren-mode vs blink-matching-paren-on-screen

[martin rudalics]

(1) Invoke Emacs with -q

Do M-x customize-option RET blink-matching-paren-on-screen RET
blink-matching-paren-on-screen is "on (non-nil)" its State is STANDARD.
Hit Finish.

Do M-x customize-option RET show-paren-mode RET, hit Toggle and Set for
Current Session.

Do M-x customize-option RET blink-matching-paren-on-screen RET
blink-matching-paren-on-screen is now "off (nil)" its State has been
CHANGED outside Customize; operating on it here may be unreliable.

But I have not done anything outside customize.


(2) Invoke Emacs with -q

Do M-x customize-option RET blink-matching-paren-on-screen RET
blink-matching-paren-on-screen is "on (non-nil)" its State is STANDARD.
Hit Toggle and Set for Current Session.
blink-matching-paren-on-screen is now "off (nil)" its State is SET for
current session only.
Hit Finish.

Do M-x customize-option RET show-paren-mode RET, hit Toggle and Set for
Current Session.
show-paren-mode is now "on (non-nil)" its State is SET for current
session only.

Do M-x customize-option RET show-paren-mode RET, hit Toggle and Set for
Current Session.
show-paren-mode is now "off (nil)" its State is SET for current
session only.

Switch to buffer *scratch* and type the text

(foo)

After typing the closing paren the cursor will move to the open paren
although that feature should have been turned off.  When I now do

M-x customize-option RET blink-matching-paren-on-screen RET

I'm told that

blink-matching-paren-on-screen is "on (non-nil)" its State has been
CHANGED outside Customize; operating on it here may be unreliable.