fix: change EndOfBuffer highlight for popups (#288)

Author: l-kershaw

lua/plenary/popup/init.lua

@@ -386,7 +386,11 @@ function popup.create(what, vim_options)
   end
 
   if vim_options.highlight then
-    vim.api.nvim_win_set_option(win_id, "winhl", string.format("Normal:%s", vim_options.highlight))
+    vim.api.nvim_win_set_option(
+      win_id,
+      "winhl",
+      string.format("Normal:%s,EndOfBuffer:%s", vim_options.highlight, vim_options.highlight)
+    )
   end
 
   -- enter

tests/plenary/popup_spec.lua

@@ -27,7 +27,7 @@ describe("plenary.popup", function()
       highlight = "PopupColor1",
     })
 
-    eq("Normal:PopupColor1", vim.api.nvim_win_get_option(win_id, "winhl"))
+    eq("Normal:PopupColor1,EndOfBuffer:PopupColor1", vim.api.nvim_win_get_option(win_id, "winhl"))
   end)
 
   it("can create a border", function()