Re: visual line mode

[Eli Zaretskii <eliz@gnu.org>]

> From: Peter Dyballa <Peter_Dyballa@Web.de>
> Date: Sat, 13 Oct 2012 23:54:54 +0200
> Cc: Help-gnu-emacs@gnu.org
> 
> Create a file containing that line with TABS between "6)" and "von":
> 
> 	Tausendschönchen (Sedmikrasky) (1966)				von Vera Chytilová
> 
> Launch GNU Emacs with -Q and visit that file read-only. Activate visual line mode. Resize the frame's width to 15 columns ("C-a C-u 14 C-f" should put the cursor into the last, right-most column). Position the cursor at the SPACE in the name "Vera Chytilová" and use the cursor movement keys to make the text cursor move upwards. In the visible line with TABs it will not go upwards but leftwards, in a left-to-right script one TAB backwards, as it will do on the visible line above, where UP makes it jump to column 0, i.e., left of "(1966)". On next UP it's back in the column where the cursor started.
> 
> When I position the text cursor with the mouse on the second "n" in "Tausendschönchen" and then press CURSOR DOWN it jumps over all the TABs after "(1966)" and lands on the "a" in "Very Chytilová" instead of the SPACE…

These are bugs.

> > I have no problem with this when I try it now.  Does it happen for you
> > in "emacs -Q", if you just turn on visual-line-mode?
> 
> I certainly have to click a lot more. What I encountered is that I clicked into column X on some line and repeatedly the text from the last column until where I clicked was high-lighted. Or when I clicked into column Y on some other line the text cursor was put into column (X - N).

I don't see this problem.

> 	% \DeclareGraphicsExtensions{.pdf,.png,.jpeg}	 % in pdfTeX allowed graphics formats
> 
> is:
> 
> a) position the cursor in column 0 on the "%"
> b) perform RIGHT C-u C-x = RIGHT C-u C-x = RIGHT C-u C-x = RIGHT C-u C-x = (this is exactly four times right on exactly one SPACE character)
> 
> The *Messages* buffer contains:
> 
> 	Char: % (37, #o45, #x25) point=2577 of 37255 (7%) column=0
> 	
> 	Char: SPC (32, #o40, #x20) point=2578 of 37255 (7%) column=1
> 	
> 	Char: SPC (32, #o40, #x20) point=2579 of 37255 (7%) column=2
> 	
> 	Char: SPC (32, #o40, #x20) point=2580 of 37255 (7%) column=3
> 	
> 	Char: SPC (32, #o40, #x20) point=2581 of 37255 (7%) column=4

I don't see this, either.  I get the correct characters shown in the
echo area and in *Messages*.

> I prefer to have a GNU Emacs that is as true and reliable as Honest John, the sheriff with the hat of the Mounted Police, played by W.C. Fields, in the film “Six Of A Kind”, who explains at a billiard pool why he carries the honourable name "Honest".

It will never be that.