feat: add options for popup being focusable (#216)

Author: l-kershaw

lua/plenary/popup/init.lua

@@ -201,6 +201,10 @@ function popup.create(what, vim_options)
   -- noautocmd, undocumented vim default per https://github.com/vim/vim/issues/5737
   win_opts.noautocmd = vim.F.if_nil(vim_options.noautocmd, true)
 
+  -- focusable,
+  -- vim popups are not focusable windows
+  win_opts.focusable = vim.F.if_nil(vim_options.focusable, false)
+
   local win_id
   if vim_options.hidden then
     assert(false, "I have not implemented this yet and don't know how")
@@ -346,6 +350,7 @@ function popup.create(what, vim_options)
 
   local border = nil
   if should_show_border then
+    border_options.focusable = vim_options.border_focusable
     border = Border:new(bufnr, win_id, win_opts, border_options)
   end
 

lua/plenary/window/border.lua

@@ -189,6 +189,7 @@ function Border:new(content_bufnr, content_win_id, content_win_options, border_w
     width = content_win_options.width + thickness.left + thickness.right,
     height = content_win_options.height + thickness.top + thickness.bot,
     noautocmd = content_win_options.noautocmd,
+    focusable = vim.F.if_nil(border_win_options.focusable, false),
   })
 
   vim.cmd(