patch 9.1.0888: leftcol property not available in getwininfo()

Problem:  leftcol property not available in getwininfo()
Solution: add leftcol property property (glepnir)

closes: #16119

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/doc/builtin.txt

@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.1.  Last change: 2024 Nov 18
+*builtin.txt*	For Vim version 9.1.  Last change: 2024 Nov 26
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -5086,6 +5086,8 @@ getwininfo([{winid}])					*getwininfo()*
 			botline		last complete displayed buffer line
 			bufnr		number of buffer in the window
 			height		window height (excluding winbar)
+			leftcol		first column displayed; only used when
+					'wrap' is off
 			loclist		1 if showing a location list
 					{only with the +quickfix feature}
 			quickfix	1 if quickfix or location list window

src/evalwindow.c

@@ -426,6 +426,7 @@ get_win_info(win_T *wp, short tpnr, short winnr)
     dict_add_number(dict, "wincol", wp->w_wincol + 1);
     dict_add_number(dict, "textoff", win_col_off(wp));
     dict_add_number(dict, "bufnr", wp->w_buffer->b_fnum);
+    dict_add_number(dict, "leftcol", wp->w_leftcol);
 
 #ifdef FEAT_TERMINAL
     dict_add_number(dict, "terminal", bt_terminal(wp->w_buffer));

src/testdir/test_bufwintabinfo.vim

@@ -115,6 +115,18 @@ func Test_getbufwintabinfo()
   wincmd t | only
 endfunc
 
+function Test_get_wininfo_leftcol()
+  set nowrap
+  set winwidth=10
+  vsp
+  call setline(1, ['abcdefghijklmnopqrstuvwxyz'])
+  norm! 5zl
+  call assert_equal(5, getwininfo()[0].leftcol)
+  bwipe!
+  set wrap&
+  set winwidth&
+endfunc
+
 function Test_get_buf_options()
   let opts = bufnr()->getbufvar('&')
   call assert_equal(v:t_dict, type(opts))

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    888,
 /**/
     887,
 /**/