patch 9.1.2027: filetype: bicep filetype used for 2 bicep file types

Commit: 
https://github.com/vim/vim/commit/4e722fdfdd987c11136e3533bd65d0ed4d15f829
Author: Scott McKendry <[email protected]>
Date:   Sat Dec 27 15:15:35 2025 +0000

    patch 9.1.2027: filetype: bicep filetype used for 2 bicep file types
    
    Problem:  filetype: bicep filetype used for 2 bicep file types
    Solution: Detect *.bicepparam files as bicep-param filetype, include
              new bicep-params and bicep filetype plugin
              (Scott McKendry)
    
    The bicep language server handles parameter files differently than
    regular bicep files. Treating them the same at the editor level leads to
    false positive diagnostics in the editor.
    
    References:
    
    Bicep Language Constants:
    - 
https://github.com/Azure/bicep/blob/51392d32ca2c8b94b1bb7a255e78e1d559d12573/src/Bicep.Core/LanguageConstants.cs#L23
    VS Code Extension definition:
    - 
https://github.com/Azure/bicep/blob/51392d32ca2c8b94b1bb7a255e78e1d559d12573/src/vscode-bicep/package.json#L47
    
    closes: #19026
    
    Signed-off-by: Scott McKendry <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/.github/MAINTAINERS b/.github/MAINTAINERS
index 64ec25726..94c9eff88 100644
--- a/.github/MAINTAINERS
+++ b/.github/MAINTAINERS
@@ -127,6 +127,8 @@ runtime/ftplugin/asy.vim                            
@avidseeker
 runtime/ftplugin/autohotkey.vim                                @telemachus
 runtime/ftplugin/awk.vim                               @dkearns
 runtime/ftplugin/basic.vim                             @dkearns
+runtime/ftplugin/bicep.vim                             @scottmckendry
+runtime/ftplugin/bicep-params.vim                              @scottmckendry
 runtime/ftplugin/brighterscript.vim                    @ribru17
 runtime/ftplugin/brightscript.vim                      @ribru17
 runtime/ftplugin/bst.vim                               @tpope
diff --git a/runtime/autoload/dist/ft.vim b/runtime/autoload/dist/ft.vim
index 0ab087b0f..a81768bbd 100644
--- a/runtime/autoload/dist/ft.vim
+++ b/runtime/autoload/dist/ft.vim
@@ -3,7 +3,7 @@ vim9script
 # Vim functions for file type detection
 #
 # Maintainer:          The Vim Project <https://github.com/vim/vim>
-# Last Change:         2025 Dec 26
+# Last Change:         2025 Dec 27
 # Former Maintainer:   Bram Moolenaar <[email protected]>
 
 # These functions are moved here from runtime/filetype.vim to make startup
@@ -1746,7 +1746,7 @@ const ft_from_ext = {
   "bst": "bst",
   # Bicep
   "bicep": "bicep",
-  "bicepparam": "bicep",
+  "bicepparam": "bicep-params",
   # BIND zone
   "zone": "bindzone",
   # Blank
diff --git a/runtime/ftplugin/bicep-params.vim 
b/runtime/ftplugin/bicep-params.vim
new file mode 100644
index 000000000..7cc2d8512
--- /dev/null
+++ b/runtime/ftplugin/bicep-params.vim
@@ -0,0 +1,3 @@
+" Placeholder for maximum compatibility. While bicepparam files are treated as 
distinct filetypes,
+" they are should share the same ftplugin settings as bicep files.
+runtime! ftplugin/bicep.vim
diff --git a/runtime/ftplugin/bicep.vim b/runtime/ftplugin/bicep.vim
new file mode 100644
index 000000000..f142daf13
--- /dev/null
+++ b/runtime/ftplugin/bicep.vim
@@ -0,0 +1,14 @@
+" Vim filetype plugin
+" Language:    Bicep
+" Maintainer:  Scott McKendry <[email protected]>
+" Last Change: 2025 Dec 27
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+setlocal comments=s1:/*,mb:*,ex:*/,://
+setlocal commentstring=//\ %s
+
+let b:undo_ftplugin = "setlocal comments< commentstring<"
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index b3e6fc171..cdf854bdd 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -140,7 +140,8 @@ def s:GetFilenameChecks(): dict<list<string>>
     bdf: ['file.bdf'],
     beancount: ['file.beancount'],
     bib: ['file.bib'],
-    bicep: ['file.bicep', 'file.bicepparam'],
+    bicep: ['file.bicep'],
+    bicep-params: ['file.bicepparam'],
     bindzone: ['named.root', '/bind/db.file', '/named/db.file', 
'any/bind/db.file', 'any/named/db.file', 'foobar.zone'],
     bitbake: ['file.bb', 'file.bbappend', 'file.bbclass', 
'build/conf/local.conf', 'meta/conf/layer.conf', 'build/conf/bbappend.conf', 
'meta-layer/conf/distro/foo.conf',
       'project-spec/configs/zynqmp-generic-xczu7ev.conf'],
diff --git a/src/version.c b/src/version.c
index 14e983bea..a4d0ed19a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2027,
 /**/
     2026,
 /**/

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