Ok, i got a mistake to use indirect buffer in this way. The text properties of base buffer are shared with indirect buffers.

Due to svg in emacs is not fully support, i have implemented this by using impatient-mode with web-browser, when the svg file modified the preview will be changed at the same time.

Michael Heerdegen <michael_heerdegen@web.de> writes:

PENG Kevin <kevin.remegame@gmail.com> writes:

[+]

The text of the indirect buffer is always identical to the text of its base buffer; changes made by editing either one are visible immediately in the other. “Text” here includes both the characters and their text properties.

`image-mode' uses text properties to display the image! Most major modes use text properties to font-lock the buffer and change the way how its contents are displayed.

Use cases of indirect buffers are limited, maybe we need to warn more explicitly that their usefulness is very restricted. IIRC, having indirect and base buffer using different major modes is something that was never supported.

From the past discussions about the matter I also recall that the limitations are lying in the concept and we can't do much here without a reimplementation of the idea.

So I would suggest to rather think about how to get what you want without using indirect buffers.

Michael.