Re: Scrolling text erases the search highlight

[Gabriel TEIXEIRA <gabriel_teixeira@sdesigns.eu>]

On 23/07/2010 12:53, Andreas Röhler wrote:
> Am 23.07.2010 11:25, schrieb Deniz Dogan:
>> 2010/7/23 Gabriel TEIXEIRA<gabriel_teixeira@sdesigns.eu>:
>>> On 13/07/2010 15:54, Gabriel TEIXEIRA wrote:
>>>>
>>>> On 13/07/2010 15:38, Deniz Dogan wrote:
>>>>>
>>>>> 2010/7/13 Gabriel TEIXEIRA<gabriel_teixeira@sdesigns.eu>:
>>>>>>
>>>>>> On 13/07/2010 09:14, Deniz Dogan wrote:
>>>>>>
>>>>>>> 2010/7/12 Qiang Guo<mcknight0219@gmail.com>:
>>>>>>>
>>>>>>>> You may want to check variable 'isearch-allow-scroll'
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>> This is a good suggestion. But you may also want to know about 
>>>>>>> "M-s o".
>>>>>>>
>>>>>>> M-s o runs the command occur, which is an interactive compiled Lisp
>>>>>>> function in `replace.el'.
>>>>>>>
>>>>>>> It is bound to M-s o.
>>>>>>>
>>>>>>> (occur REGEXP&optional NLINES)
>>>>>>>
>>>>>>> Show all lines in the current buffer containing a match for REGEXP.
>>>>>>> This function can not handle matches that span more than one line.
>>>>>>>
>>>>>>>
>>>>>> Thanks for the answers and sorry for the multiple messages, the 
>>>>>> M-s o is
>>>>>>
>>>>>> very useful, but the isearch-allow-scroll doesn't work very well 
>>>>>> with
>>>>>> me. It
>>>>>> will conserve the search if I do C-l or C-v, but won't if I use the
>>>>>> mouse
>>>>>> scroll wheel or if I use the arrow keys to move the cursor (which 
>>>>>> are
>>>>>> the
>>>>>> way I scroll the screen mostly). I want something that works 
>>>>>> similar to
>>>>>> the
>>>>>> Linux man search, the vim or the gedit, that conserves the 
>>>>>> highlight as
>>>>>> long
>>>>>> as the search is erased. Any other suggestions?
>>>>>>
>>>>>>
>>>>>>
>>>>> For what it's worth, scrolling using the mouse works fine using: GNU
>>>>> Emacs 24.0.50.1 (i386-mingw-nt6.1.7600) of 2010-07-12 on 3249CTO
>>>>>
>>>> Yes, I'm using version 23.1.1. I couldn't realize that this could 
>>>> be the
>>>> version of emacs. I will install a newer version to check it out. 
>>>> Hopefully
>>>> won't break with my .emacs config file :)
>>>> Many many thanks for your help
>>>>
>>>>
>>> Hello back
>>>
>>> After I recompiled my emacs to the 24.0.50.1, the problems of 
>>> scrolling were
>>> solved mostly, but now after some time of usage I noticed a weird 
>>> behaviour:
>>> Now that I can scroll freely, I noticed that it won't scroll beyond the
>>> position were the cursor is located (meaning that if I have one 
>>> result in
>>> the line 150 and my text has 1000 lines and my buffer is 80 lines 
>>> tall, I
>>> can't scroll to see above the line 70 nor after the line 230), so I am
>>> limited to scrolling the buffer that is near a result of the 
>>> searched text,
>>> and if I try to move the cursor away in order to scroll more or just to
>>> change some text around it will erase the search too (and I come 
>>> back with
>>> the original problem again). Any idea to how to solve that?
>>>
>>
>> As far as I know, there is no way to get around that problem today. I
>> think the main issue is that in Emacs point is always in the visible
>> portion of the buffer.
>>
>
> Hi,
>
> IMHO there is a way,
>
> making functions doing de-highlighting conditional
>
> (unless (or (eq last-command-event 'next)
>           (eq last-command-event 'prior))
>
> for example
>
> (defun isearch-dehighlight ()
>   (unless (or (eq last-command-event 'next)
>               (eq last-command-event 'prior))
>   (when isearch-overlay
>     (delete-overlay isearch-overlay))))
>
>
> same with
>
> lazy-highlight-cleanup
>
> and maybe some more.
>
> Produces visible effect here.
>
> Some more/other will arise nonetheless:
> isearch highlighting is done in visible portion of buffer only.
> Starting scroll with both changes as above will keep the highlights 
> set so far, but not highlight further, now scrolled portion.
>
>
> Cheers
>
>
> Andreas
>
> -- 
> https://code.launchpad.net/~a-roehler/python-mode
> https://code.launchpad.net/s-x-emacs-werkstatt/
>
>
>
>
Well, I tried just the isearch-dehighlight, but it doesn't work at all. 
I will try to find by myself the solution using the tips you gave me 
(Not before I master emacs a little bit further, I'm just starting...).

Vielen Dank!
Gabriel Teixeira