feat: add NvimTreeNormalFloat (#2167)

* feat: add `NormalFloat` hl for floating windows

* fix: follow default floatwin bg color

---------

Co-authored-by: Alexander Courtis <alex@courtis.org>

Author: jamestansx

doc/nvim-tree-lua.txt

@@ -2065,6 +2065,7 @@ NvimTreeWindowPicker
 There are also links to normal bindings to style the tree itself.
 
 NvimTreeNormal
+NvimTreeNormalFloat
 NvimTreeEndOfBuffer     (NonText)
 NvimTreeCursorLine      (CursorLine)
 NvimTreeCursorLineNr    (CursorLineNr)

lua/nvim-tree/colors.lua

@@ -66,6 +66,7 @@ local function get_links()
     OpenedFolderIcon = "NvimTreeFolderIcon",
     ClosedFolderIcon = "NvimTreeFolderIcon",
     Normal = "Normal",
+    NormalFloat = "NormalFloat",
     NormalNC = "NvimTreeNormal",
     EndOfBuffer = "EndOfBuffer",
     CursorLineNr = "CursorLineNr",

lua/nvim-tree/help.lua

@@ -5,7 +5,8 @@ local PAT_CTRL = "^<C%-"
 local PAT_SPECIAL = "^<.+"
 
 local WIN_HL = table.concat({
-  "Normal:NvimTreeNormal",
+  "NormalFloat:NvimTreeNormalFloat",
+  "WinSeparator:NvimTreeWinSeparator",
   "CursorLine:NvimTreeCursorLine",
 }, ",")
 

lua/nvim-tree/view.lua

@@ -32,15 +32,16 @@ M.View = {
     wrap = false,
     winhl = table.concat({
       "EndOfBuffer:NvimTreeEndOfBuffer",
-      "Normal:NvimTreeNormal",
       "CursorLine:NvimTreeCursorLine",
       "CursorLineNr:NvimTreeCursorLineNr",
       "LineNr:NvimTreeLineNr",
       "WinSeparator:NvimTreeWinSeparator",
       "StatusLine:NvimTreeStatusLine",
       "StatusLineNC:NvimTreeStatuslineNC",
       "SignColumn:NvimTreeSignColumn",
+      "Normal:NvimTreeNormal",
       "NormalNC:NvimTreeNormalNC",
+      "NormalFloat:NvimTreeNormalFloat",
     }, ","),
   },
 }