ui: forward 'linespace' option #7883

ref #7520

runtime/doc/options.txt

@@ -3676,7 +3676,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 <	Minimum value is 2, maximum value is 1000.
 
 						*'linespace'* *'lsp'*
-'linespace' 'lsp'	number	(default 0, 1 for Win32 GUI)
+'linespace' 'lsp'	number	(default 0)
 			global
 			{only in the GUI}
 	Number of pixel lines inserted between characters.  Useful if the font

runtime/doc/ui.txt

@@ -90,6 +90,7 @@ Global Events							    *ui-global*
 	'guifont'
 	'guifontset'
 	'guifontwide'
+	'linespace'
 	'showtabline'
 	'termguicolors'
 

src/nvim/option_defs.h

@@ -481,6 +481,7 @@ EXTERN char_u   *p_langmap;     // 'langmap'
 EXTERN int p_lnr;               // 'langnoremap'
 EXTERN int p_lrm;               // 'langremap'
 EXTERN char_u   *p_lm;          // 'langmenu'
+EXTERN long     *p_linespace;   // 'linespace'
 EXTERN char_u   *p_lispwords;   // 'lispwords'
 EXTERN long p_ls;               // 'laststatus'
 EXTERN long p_stal;             // 'showtabline'

src/nvim/options.lua

@@ -1399,8 +1399,9 @@ return {
       full_name='linespace', abbreviation='lsp',
       type='number', scope={'global'},
       vi_def=true,
-      redraw={'everything'},
+      redraw={'everything', 'ui_option'},
-      enable_if=false,
+      varname='p_linespace',
+      defaults={if_true={vi=0}}
     },
     {
       full_name='lisp',

test/functional/ui/options_spec.lua

@@ -24,6 +24,7 @@ describe('ui receives option updates', function()
     guifont='',
     guifontset='',
     guifontwide='',
+    linespace=0,
     showtabline=1,
     termguicolors=false,
   }
@@ -58,6 +59,18 @@ describe('ui receives option updates', function()
       eq(changed, screen.options)
     end)
 
+    command("set linespace=13")
+    changed.linespace = 13
+    screen:expect(function()
+      eq(changed, screen.options)
+    end)
+
+    command("set linespace=-11")
+    changed.linespace = -11
+    screen:expect(function()
+      eq(changed, screen.options)
+    end)
+
     command("set all&")
     screen:expect(function()
       eq(defaults, screen.options)