[oXygen-user] [OXYGEN-9712] Why is the size limit so low for comfortably editing files in text mode in scripts such as Tamil?

[Oxygen XML Editor Support (Adrian Buza)]

Hello,

Tamil is a script that requires "special characters" support in text 
mode. When you open in Oxygen a document that contains such script (with 
default options) you are prompted to Enable/Disable support for 
bidirectional text and special characters. When this support is enabled, 
the performance is affected significantly. Larger documents incur a more 
significant performance penalty. By default *this support is disabled 
for files larger than 300KB, but performance can be acceptable for up to 
800KB.*
https://www.oxygenxml.com/doc/versions/26.0/ug-editor/topics/bidirectional-support.html

> if I edit in text mode a file containing the equivalent of 60 pages 
> (which has a *size of 693 kB*), I can no longer trust what I see and 
> have to enter the Tamil text without paying attention to the position 
> of the cursor, which is far to the right side of the actual insertion 
> position.
>
> Why is that the case?
To answer your question, if you have the default limit of 300k in Oxygen 
and are editing a file that is larger, the "special characters" support 
is disabled without notification. With the support disabled, it is 
normal for the cursor positioning and editing to be "off".
If you want to have it enabled, go to Options > Preferences, Editor > 
Open/Save and in the section "Support for Special Characters" *configure 
the 'Disable special characters support for documents larger than 
(characters)' limit to 800k*. If you feel confident it will hold, you 
could clear the Disable box (so that it never gets disabled), but be 
aware that the larger the document, the more it will slow down, up to 
making it appear as hanged. If you disable the limit, I would advise to 
at least set it to "Prompt for each document", so you can disable it 
yourself when it's not needed.

> Why is a text editor such as Notepad++ capable of doing what oXygen 
> cannot do, with respect to rendering text containing complex scritps 
> such as Tamil? 
Oxygen XML Editor is a Java application and at least for the text mode 
it uses the support that Java implements for rendering texts and 
managing cursor positions. When dealing with large file sizes and 
special scripts, the Java implementation struggles to efficiently handle 
the text rendering and cursor positioning due the complexity and nuances 
of the script that is not handled natively.

On the other hand, text editors like Notepad++, which are solely built 
for handling text files, might perform better with large files and 
complex scripts because they use native methods (OS support) to render 
and manage cursor positions in the text.

Regards,
Adrian

Adrian Buza
oXygen XML Editor and Author Support

On 24.10.2023 23:41, Jean-Luc Chevillard wrote:
> Dear list,
>
> I have often wondered why the size limit so low for comfortably 
> editing files in text mode in scripts such as Tamil?
>
> I am currently editing an ancient Portuguese-Tamil dictionary
> and as soon as the file size reaches a certain size, I can no longer 
> trust the cursor position.
>
> To give an example,
> if I edit today in text mode a file containing the equivalent of one 
> page, which has a size of 23 kB, I can trust the position of the cursor
> on screen to show me where the next Tamil character will be inserted.
>
> HOWEVER, if I edit in text mode a file containing the equivalent of 60 
> pages (which has a size of 693 kB), I can no longer trust what I see 
> and have to enter the Tamil text without paying attention to the 
> position of the cursor, which is far to the right side of the actual 
> insertion position.
>
> Why is that the case?
>
> Why is a text editor such as Notepad++ capable of doing what oXygen 
> cannot do, with respect to rendering text containing complex scritps 
> such as Tamil?
>
> Am I doing something wrong?
>
> I would like to know
>
> Thanks for any solution provided
>
> -- Jean-Luc Chevillard
>
> https://htl.cnrs.fr/equipe/jl-chevillard/
>
>
> P.S. The problem does not occur in Author mode, but one does not 
> always want to define a .CSS
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> oXygen-user at oxygenxml.com
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>

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