fix(Popup): don't override open() options

The window options were overriding the passed in options. We shouldn't
do that.

doc/libmodal-lua.txt

@@ -328,7 +328,7 @@ opened with the following options: >
 --------------------------------------------------------------------------------
 VARIABLES                                         *libmodal-lua-Popup-variables*
 
-`Popup`.config                                     *libmodal-lua-Popup.apiOptions*
+`Popup`.config                                         *libmodal-lua-Popup.config*
 
 	The options used when opening a `Popup`.
 
@@ -413,10 +413,14 @@ FUNCTIONS                                         *libmodal-lua-Popup-functions*
 		{inputBytes}  An array-like `table` of |char2nr|s to write to the
 		              `Popup`.
 
-`Popup`.new()                                           *libmodal-lua-Popup.new()*
+`Popup`.new({config})                                   *libmodal-lua-Popup.new()*
 
 	Create a new `Popup` and immediately open it.
 
+	Parameters: ~
+		{config}  Same as |nvim_open_win| {config}.
+		          Note: defaults to |Popup.config|.
+
 	Return: ~
 		  * A new `Popup`.
 

lua/libmodal/src/collections/Popup.lua

@@ -85,7 +85,7 @@ function _metaPopup:open(config)
 	if not config then config = Popup.config end
 
 	if valid(self.window) then
-		config = vim.tbl_extend('force', config, api.nvim_win_get_config(self.window))
+		config = vim.tbl_extend('keep', config, api.nvim_win_get_config(self.window))
 		self:close(true)
 	end
 
@@ -141,7 +141,7 @@ end
 	* A new popup window.
 ]]
 --------------------
-function Popup.new()
+function Popup.new(config)
 	local buf = api.nvim_create_buf(false, true)
 
 	local self = setmetatable(
@@ -152,7 +152,7 @@ function Popup.new()
 		_metaPopup
 	)
 
-	self:open()
+	self:open(config)
 
 	return self
 end