Re: Strange behavior using caret or backtick

On 22/10/12 18:51, Ben Fritz wrote:
> On Monday, October 22, 2012 10:27:49 AM UTC-5, Axel Bender wrote:
>> Since some patches I experience the following behavior ([] denotes the cursor position, current patch level: 7.3.709):
>>
>> a[a]aa -> a
>> aa[]aa -> <spc>
>> aa []aa -> ^
>> aa []aa -> <spc> " Should result in "aa ^[]aa"
>> aa []aa -> <esc>
>> aa[ ]aa -> s " gA shows 0x20
>> []$a aa " Should result in "aa[]$aa"
>>
>> This seems to be a bug. Can anyone verify this (Windows 7 64-bit; MinGW64-compiled)?
>
> I cannot reproduce on Windows XP 64-bit with the "Vim without Cream" build of 7.3.709. I'm not 100% clear I understood your procedure however. Here is what I did:
>
> 1. gvim -N -u NONE -i NONE
> 2. Press a, enter text "aaaa", press <Esc> key.
> 3. Press 0 and then l to place the cursor on the second 'a' character.
> 4. Press a to enter insert mode
> 5. Press <Space> key to insert a space character
> 6. Press Shift+6 to enter a literal '^' character.
> 7. Press <Space> key again
> 8. Press <Esc> to leave insert mode
> 9. Verify text as expected: "aa ^ aa" with cursor on the second space character.
> 10. Press 's' to delete the space and go into insert mode
> 11. Press $ to insert a '$' character.
> 12. Verify text as expected: "aa ^$aa" with cursor between the $ and a character.
>

Which key(s) to press to get a ^ (spacing circumflex) depends on your
keyboard layout.

On most French-language AZERTY keyboards, the key on the right of the P
(as in AZERTYUIOP), when unshifted, is a dead-circumflex (and when
shifted, a dead diaeresis/umlaut), so <dead-^><space> produces a spacing ^

This is also true on my Belgian keyboard (some of whose non-numeric
non-alphabetic keys are other than in France) and in addition,
<Alt-Gr+NoShift+6> (6 is shifted on this keyboard) also produces a
spacing ^ (for details, see
http://users.skynet.be/antoine.mechelynck/other/keybbe.htm )

If Axel's keyboard is of this kind, by "^" he may be meaning "dead-^"
which, by itself, is not seen by Vim: Vim only sees it if it is followed
by some letter which has a precombined variant with circumflex: this
means space or dead-^ (either of which produces a spacing ^), any vowel,
or, at least in a UTF-8 locale, the consonants c g h j s (upper- or
lowercase) because ĉ ĝ ĥ ĵ ŝ (and ŭ) exist in Esperanto. If followed by
something else, some keyboard drivers (as the one I had on MS-DOS) will
change the dead-^ to a spacing-^ (so that "dead ^" followed by p becomes
^p), others (as the one I now have on Linux) will disregard both
keystrokes and pass nothing to the keyboard input buffer…

And no, I can't reproduce what Axel shows, neither by assuming that his
^ is a dead ^ nor that it is a spacing ^. Obviously the dollar sign
keypress somehow never was reflected in his email. If I hit dollar after
the s keypress, and assuming a dead circumflex, I get, as expected, aa
^|aa after hitting dead-^ followed by space, and aa $|aa if I hit
<esc>s$ thereafter, where | represents the left (black) side of the
insert-mode cursor.


Best regards,
Tony.
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