runtime(bitbake): fix multiline Python function parameter syntax

Commit: 
https://github.com/vim/vim/commit/5fe4faa711b5a4736529c94ace306de17d7a20de
Author: Martin Schwan <[email protected]>
Date:   Mon Oct 13 18:50:20 2025 +0000

    runtime(bitbake): fix multiline Python function parameter syntax
    
    Fix syntax highlighting for def-style Python functions, with their
    parameters spanning multiple lines. E.g. the following should match as
    valid Python code in Bitbake recipes:
    
        def myFunction(one, two, \
                       three, four):
            pass
    
    For this to work, use the prefix modifier "\_" before the wildcard ".",
    to also match newline characters.
    
    closes: #18565
    
    Signed-off-by: Martin Schwan <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/syntax/bitbake.vim b/runtime/syntax/bitbake.vim
index 30f34474a..5e9bc5829 100644
--- a/runtime/syntax/bitbake.vim
+++ b/runtime/syntax/bitbake.vim
@@ -4,6 +4,8 @@
 "               Ricardo Salveti <[email protected]>
 " Copyright:    Copyright (C) 2004  Chris Larson <[email protected]>
 "               Copyright (C) 2008  Ricardo Salveti <[email protected]>
+" Last Change:  2022 Jul 25
+" 2025 Oct 13 by Vim project: update multiline function syntax #18565
 "
 " This file is licensed under the MIT license, see COPYING.MIT in
 " this source distribution for the terms.
@@ -95,7 +97,7 @@ syn region bbPyFuncRegion       matchgroup=bbDelimiter 
start="{\s*$" end="^}\s*$
 
 " BitBake 'def'd python functions
 syn keyword bbPyDef             def contained
-syn region bbPyDefRegion        
start='^\(def\s\+\)\([0-9A-Za-z_-]\+\)\(\s*(.*)\s*\):\s*$' end='^\(\s\|$\)\@!' 
contains=@python
+syn region bbPyDefRegion        
start='^\(def\s\+\)\([0-9A-Za-z_-]\+\)\(\s*(\_.*)\s*\):\s*$' 
end='^\(\s\|$\)\@!' contains=@python
 
 " Highlighting Definitions
 hi def link bbUnmatched         Error

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