feat(ui): add NeoTreeFloatNormal highlight group (#648)

closes #634

Author: figsoda

lua/neo-tree/setup/init.lua

@@ -123,7 +123,7 @@ M.buffer_enter_event = function()
   end
   if vim.bo.filetype == "neo-tree-popup" then
     vim.cmd([[
-    setlocal winhighlight=Normal:NeoTreeNormal,FloatBorder:NeoTreeFloatBorder
+    setlocal winhighlight=Normal:NeoTreeFloatNormal,FloatBorder:NeoTreeFloatBorder
     setlocal nolist nospell nonumber norelativenumber
     ]])
     events.fire_event(events.NEO_TREE_POPUP_BUFFER_ENTER)

lua/neo-tree/sources/common/preview.lua

@@ -68,6 +68,10 @@ local function create_floating_preview_window(state)
     },
     win_options = {
       number = true,
+      winhighlight = "Normal:"
+        .. highlights.FLOAT_NORMAL
+        .. ",FloatBorder:"
+        .. highlights.FLOAT_BORDER,
     },
   })
   options.zindex = 40

lua/neo-tree/ui/highlights.lua

@@ -19,6 +19,7 @@ M.FILE_NAME = "NeoTreeFileName"
 M.FILE_NAME_OPENED = "NeoTreeFileNameOpened"
 M.FILTER_TERM = "NeoTreeFilterTerm"
 M.FLOAT_BORDER = "NeoTreeFloatBorder"
+M.FLOAT_NORMAL = "NeoTreeFloatNormal"
 M.FLOAT_TITLE = "NeoTreeFloatTitle"
 M.GIT_ADDED = "NeoTreeGitAdded"
 M.GIT_CONFLICT = "NeoTreeGitConflict"
@@ -219,6 +220,8 @@ M.setup = function()
   local float_border_hl =
     M.create_highlight_group(M.FLOAT_BORDER, { "FloatBorder" }, normalnc_hl.background, "444444")
 
+  M.create_highlight_group(M.FLOAT_NORMAL, { "NormalFloat", M.NORMAL })
+
   M.create_highlight_group(M.FLOAT_TITLE, {}, float_border_hl.background, normal_hl.foreground)
 
   local title_fg = normal_hl.background

lua/neo-tree/ui/popups.lua

@@ -36,7 +36,10 @@ M.popup_options = function(title, min_width, override_options)
       highlight = highlights.FLOAT_BORDER,
     },
     win_options = {
-      winhighlight = "Normal:Normal,FloatBorder:" .. highlights.FLOAT_BORDER,
+      winhighlight = "Normal:"
+        .. highlights.FLOAT_NORMAL
+        .. ",FloatBorder:"
+        .. highlights.FLOAT_BORDER,
     },
     buf_options = {
       bufhidden = "delete",