Fix bug in c-family indentation logic after visibility labels

Fixes #872

rc/core/c-family.kak

@@ -54,7 +54,7 @@ def -hidden _c-family-indent-on-newline %[ eval -draft -itersel %[
     ## indent after an opening brace
     try %[ exec -draft K s\{\h*$<ret> j <a-gt> ]
     ## indent after a label
-    try %[ exec -draft K <a-x> s[a-zA-Z0-9_-]+:\h*$<ret> j <a-gt> ]
+    try %[ exec -draft k <a-x> s[a-zA-Z0-9_-]+:\h*$<ret> j <a-gt> ]
     ## indent after a statement not followed by an opening brace
     try %[ exec -draft k <a-x> <a-k>\b(if|else|for|while)\h*\(.+?\)\h*$<ret> j <a-gt> ]
     ## align to the opening parenthesis on a previous line if its followed by text on the same line

test/regression/872-indentation-misbeahviour-c++/cmd

@@ -0,0 +1 @@
+i<ret><esc>

test/regression/872-indentation-misbeahviour-c++/in

@@ -0,0 +1,9 @@
+class foo { 
+    %(p)rivate: 
+        int a; 
+        int b; 
+    public: 
+        foo() {} 
+        void bar() { 
+        } 
+}; 

test/regression/872-indentation-misbeahviour-c++/out

@@ -0,0 +1,10 @@
+class foo { 
+
+    private: 
+        int a; 
+        int b; 
+    public: 
+        foo() {} 
+        void bar() { 
+        } 
+}; 

test/regression/872-indentation-misbeahviour-c++/rc

@@ -0,0 +1,4 @@
+source "%val{runtime}/colors/default.kak"
+source "%val{runtime}/rc/core/formatter.kak"
+source "%val{runtime}/rc/core/c-family.kak"
+set buffer filetype cpp