runtime(vim): Update indent script for line continuation with lambda

fixes: #18257
closes: #18269

Signed-off-by: Maxim Kim <habamax@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/autoload/dist/vimindent.vim

@@ -2,7 +2,7 @@ vim9script
 
 # Language:     Vim script
 # Maintainer:   github user lacygoill
-# Last Change:  2025 Jul 25
+# Last Change:  2025 Sep 11
 #
 # Includes changes from The Vim Project:
 
@@ -400,6 +400,7 @@ const LINE_CONTINUATION_AT_SOL: string = '^\s*\%('
     .. '\|' .. '[#"]\\ '
     .. '\|' .. OPERATOR
     .. '\|' .. '->\s*\h'
+    .. '\|' .. '->\s*(' # lambda call: ->((v) => v ? "ON" : "OFF")()
     .. '\|' .. '\.\h'  # dict member
     .. '\|' .. '|'
     # TODO: `}` at the start of a line is not necessarily a line continuation.

runtime/indent/testdir/vim9.in

@@ -782,3 +782,14 @@ this.value = value
 enddef
 endenum
 # END_INDENT
+
+# START_INDENT
+def ToggleBoolOpt(opt: string)
+exe $"&{opt} = !&{opt}"
+$"&{opt}"
+->eval()
+->( (v) => v ? "ON" : "OFF" )()
+->printf($"{opt} %s")
+->popup_notification({})
+enddef
+# END_INDENT

runtime/indent/testdir/vim9.ok

@@ -782,3 +782,14 @@ enum Digits
     enddef
 endenum
 # END_INDENT
+
+# START_INDENT
+def ToggleBoolOpt(opt: string)
+    exe $"&{opt} = !&{opt}"
+    $"&{opt}"
+	->eval()
+	->( (v) => v ? "ON" : "OFF" )()
+	->printf($"{opt} %s")
+	->popup_notification({})
+enddef
+# END_INDENT