feat: allow individual hl custamization of scrollbar for docs and menu

doc/cmp.txt

@@ -719,6 +719,18 @@ window.{completion,documentation}.border~
 window.{completion,documentation}.winhighlight~
   `string | cmp.WinhighlightConfig`
   Specify the window's winhighlight option.
+  See |nvim_open_win|.
+
+                     *cmp-config.window.{completion,documentation}.scrollbar_winhighlight*
+window.{completion,documentation}.scrollbar_winhighlight~
+  `string | nil`
+  Specify the winhighlight option for the scrollbar background.
+  See |nvim_open_win|.
+
+                     *cmp-config.window.{completion,documentation}.scrollbar_thumb_winhighlight*
+window.{completion,documentation}.scrollbar_thumb_winhighlight~
+  `string | nil`
+  Specify the winhighlight option for the scrollbar thumb.
   See |nvim_open_win|.
 
                      *cmp-config.window.{completion,documentation}.winblend*

lua/cmp/config/default.lua

@@ -109,6 +109,8 @@ return function()
       completion = {
         border = { '', '', '', '', '', '', '', '' },
         winhighlight = 'Normal:Pmenu,FloatBorder:Pmenu,CursorLine:PmenuSel,Search:None',
+        scrollbar_winhighlight = 'EndOfBuffer:PmenuSbar,NormalFloat:PmenuSbar',
+        scrollbar_thumb_winhighlight = 'EndOfBuffer:PmenuThumb,NormalFloat:PmenuThumb',
         winblend = vim.o.pumblend,
         scrolloff = 0,
         col_offset = 0,
@@ -120,6 +122,8 @@ return function()
         max_width = math.floor((WIDE_HEIGHT * 2) * (vim.o.columns / (WIDE_HEIGHT * 2 * 16 / 9))),
         border = { '', '', '', ' ', '', '', '', ' ' },
         winhighlight = 'FloatBorder:NormalFloat',
+        scrollbar_winhighlight = 'EndOfBuffer:PmenuSbar,NormalFloat:PmenuSbar',
+        scrollbar_thumb_winhighlight = 'EndOfBuffer:PmenuThumb,NormalFloat:PmenuThumb',
         winblend = vim.o.pumblend,
       },
     },

lua/cmp/types/cmp.lua

@@ -122,6 +122,8 @@ cmp.ItemField = {
 ---@class cmp.WindowOptions
 ---@field public border? string|string[]
 ---@field public winhighlight? string
+---@field public scrollbar_winhighlight? string
+---@field public scrollbar_thumb_winhighlight? string
 ---@field public winblend? number
 ---@field public zindex? integer|nil
 

lua/cmp/utils/window.lua

@@ -19,6 +19,7 @@ local config = require('cmp.config')
 ---@field public thumb_win integer|nil
 ---@field public sbar_win integer|nil
 ---@field public style cmp.WindowStyle
+---@field public is_doc boolean|nil
 ---@field public opt table<string, any>
 ---@field public buffer_opt table<string, any>
 local window = {}
@@ -134,6 +135,8 @@ end
 window.update = function(self)
   local info = self:info()
   if info.scrollable and self.style.height > 0 then
+    local scrollbar_winhighlight = self.is_doc and config.get().window.documentation.scrollbar_winhighlight or config.get().window.completion.scrollbar_winhighlight
+    local scrollbar_thumb_winhighlight = self.is_doc and config.get().window.documentation.scrollbar_thumb_winhighlight or config.get().window.completion.scrollbar_thumb_winhighlight
     -- Draw the background of the scrollbar
 
     if not info.border_info.visible then
@@ -151,7 +154,7 @@ window.update = function(self)
       else
         style.noautocmd = true
         self.sbar_win = vim.api.nvim_open_win(buffer.ensure(self.name .. 'sbar_buf'), false, style)
-        opt.win_set_option(self.sbar_win, 'winhighlight', 'EndOfBuffer:PmenuSbar,NormalFloat:PmenuSbar')
+        opt.win_set_option(self.sbar_win, 'winhighlight', scrollbar_winhighlight)
       end
     end
 
@@ -173,7 +176,7 @@ window.update = function(self)
     else
       style.noautocmd = true
       self.thumb_win = vim.api.nvim_open_win(buffer.ensure(self.name .. 'thumb_buf'), false, style)
-      opt.win_set_option(self.thumb_win, 'winhighlight', 'EndOfBuffer:PmenuThumb,NormalFloat:PmenuThumb')
+      opt.win_set_option(self.thumb_win, 'winhighlight', scrollbar_thumb_winhighlight)
     end
   else
     if self.sbar_win and vim.api.nvim_win_is_valid(self.sbar_win) then

lua/cmp/view/docs_view.lua

@@ -19,6 +19,7 @@ docs_view.new = function()
   self.window:option('wrap', true)
   self.window:buffer_option('filetype', 'cmp_docs')
   self.window:buffer_option('buftype', 'nofile')
+  self.window.is_doc = true
   return self
 end