runtime(vim): Update base-syntax, fix nested function folding (#14397)

Only match function folding start and end patterns at the start of a
line, excluding heredocs and :append/:change/:insert commands.

Fixes #14393

Signed-off-by: Christian Brabandt <cb@256bit.org>
Signed-off-by: Doug Kearns <dougkearns@gmail.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/runtime/syntax/testdir/input/vim_ex_def_nested.vim b/runtime/syntax/testdir/input/vim_ex_def_nested.vim
new file mode 100644
index 0000000000..008c41520a
--- /dev/null
+++ b/runtime/syntax/testdir/input/vim_ex_def_nested.vim
@@ -0,0 +1,20 @@
+vim9script
+# Vim9 :def command (nested)
+
+class Test
+    const name: string
+
+    def new()
+	def Name(): string
+	    function GiveName()
+		return "any"
+	    endfunction
+
+	    return GiveName()
+	enddef
+
+	this.name = Name()
+    enddef
+endclass
+
+echo Test.new()