feat(ui): add 'statuscolumn' option

Problem:    Unable to customize the column next to a window ('gutter').
Solution:   Add 'statuscolumn' option that follows the 'statusline' syntax,
	    allowing to customize the status column. Also supporting the %@
	    click execute function label. Adds new items @C and @s which
	    will print the fold and sign columns. Line numbers and signs
	    can be clicked, highlighted, aligned, transformed, margined etc.

1 files changed, 4 insertions, 1 deletions

diff --git a/test/functional/lua/ffi_spec.lua b/test/functional/lua/ffi_spec.lua
index 3969a7a478..18b13a8959 100644
--- a/test/functional/lua/ffi_spec.lua
+++ b/test/functional/lua/ffi_spec.lua
@@ -29,6 +29,7 @@ describe('ffi.cdef', function()
         typedef struct window_S win_T;
         typedef struct {} stl_hlrec_t;
         typedef struct {} StlClickRecord;
+        typedef struct {} statuscol_T;
         typedef struct {} Error;
 
         win_T *find_window_by_handle(int Window, Error *err);
@@ -43,7 +44,8 @@ describe('ffi.cdef', function()
           int fillchar,
           int maxwidth,
           stl_hlrec_t **hltab,
-          StlClickRecord **tabtab
+          StlClickRecord **tabtab,
+          statuscol_T *scp
         );
       ]]
 
@@ -57,6 +59,7 @@ describe('ffi.cdef', function()
         0,
         0,
         nil,
+        nil,
         nil
       )
     ]=])