Leverage neovim's new api for floating windows

with borders. This applies to auto_hover and signature_help

Author: ranjithshegde

doc/completion-nvim.txt

@@ -123,6 +123,16 @@ g:completion_enable_auto_signature        *g:completion_enable_auto_signature*
 
         default value: 1
 
+g:completion_popup_border        		*g:completion_popup_border*
+
+	By default border for auto hover popup and signature help popup
+	are set to single. You can change it as per neovim's popup/preview
+	window sepcifications.
+
+	available options: 'single', 'double', 'rounded', 'solid' and 'shadow'
+
+        default value: 'single'
+
 g:completion_enable_auto_paren		      *g:completion_enable_auto_paren*
 
 	Enable the auto insert parenthesis feature. completion-nvim will

lua/completion/hover.lua

@@ -81,6 +81,7 @@ local make_floating_popup_options = function(width, height, opts)
     focusable = false,
     style = 'minimal',
     width = width,
+	border = vim.g.completion_popup_border
   }
 end
 

lua/completion/signature_help.lua

@@ -46,11 +46,12 @@ M.autoOpenSignatureHelp = function()
 
       -- if `lines` can be trimmed, it is modified in place
       local trimmed_lines_filetype = vim.lsp.util.try_trim_markdown_code_blocks(lines)
+	  local opts = {border = vim.g.completion_popup_border}
       local bufnr, _ = vim.lsp.util.open_floating_preview(
         -- TODO show popup when signatures is empty?
         vim.lsp.util.trim_empty_lines(lines),
         trimmed_lines_filetype,
-        {}
+		opts
       )
       -- setup a variable for floating window, fix #223
       vim.api.nvim_buf_set_var(bufnr, "lsp_floating", true)

plugin/completion.vim

@@ -25,6 +25,10 @@ if ! exists('g:completion_enable_auto_hover')
     let g:completion_enable_auto_hover = 1
 endif
 
+if ! exists('g:completion_popup_border')
+    let g:completion_popup_border = 'single'
+endif
+
 if ! exists('g:completion_docked_hover')
     let g:completion_docked_hover = 0
 endif