removing a line in a hook_line differ between free and formatted buffer

[pascalpoitras]

Describe the bug

as answered by @flashcode in the issue #2087, to remove a line in a weechat_print modifier, a simple /.*// is enough, in a hook_line you must remove the buffer from buffer_name.

but when you use hook_line on a free buffer it doesn't behave this way, I mean, all you have to do is a /.*// to remove the line, you don't have to remove the buffer from buffer name.

not sure if this is a bug, I would like to know before pursuing what I'm doing since it change the way I have to implement it

Steps to reproduce

1. /trigger add test line "*;core.my_buffer_*" "" "/.*test.*//"
2. /print -switch -newbuffer my_buffer_formatted test
3. a blank line is there as expected since we didn't touch buffer_name
4. /print -switch -newbuffer my_buffer_free -free test
5. no line is printed at all but we didn't touch buffer_name...
6. proof, print a non test line it will be the first line of the buffer
7. /print -switch -newbuffer my_buffer_free -free hello

Current behavior

the behavior is not the one defined by FlashCode in the following issue #2087. So it's either a bug or he forgot to mention that it behave differently in a free buffer

Expected behavior

should print a blank line according to issue #2087

Suggested solutions

No response

Additional information

No response

WeeChat version

4.3.0

What OS are you using?

Debian 12

On which terminal are you running WeeChat?

No response

Which terminal multiplexer are you using?

No response

[flashcode]

In fact this is normal because of a specificity of free buffers: when you print a line with an empty message, this deletes the line.

If the hook_line is modified to do that, that means deleting a line on free buffer must be done with another way, and this have impact on scripts doing this.

I'm going to document this in the hook_line API function.