Add borders for floating windows in Neovim (#3603)

* Add borders for floating windows in Neovim
* Add docs for floating window border setting

Co-authored-by: w0rp <w0rp@users.noreply.github.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/doc/ale.txt b/doc/ale.txt
index 5376a16c..c87b05e2 100644
--- a/doc/ale.txt
+++ b/doc/ale.txt
@@ -653,7 +653,8 @@ Hover information can be displayed in the preview window instead by setting
 |g:ale_hover_to_preview| to `1`.
 
 When using Neovim, if |g:ale_hover_to_floating_preview| or |g:ale_floating_preview|
-is set to 1, the hover information will show in a floating window.
+is set to 1, the hover information will show in a floating window. And 
+|g:ale_floating_window_border| for the border setting.
 
 For Vim 8.1+ terminals, mouse hovering is disabled by default. Enabling
 |balloonexpr| commands in terminals can cause scrolling issues in terminals,
@@ -1205,6 +1206,19 @@ g:ale_floating_preview                                 *g:ale_floating_preview*
   |g:ale_detail_to_floating_preview| to `1`.
 
 
+g:ale_floating_window_border                       *g:ale_floating_window_border*
+
+  Type: |List|
+  Default: `['|', '-', '+', '+', '+', '+']`
+
+  When set to `[]`, window borders are disabled. The elements in the list
+  set the horizontal, top, top-left, top-right, bottom-right 
+  and bottom-left border characters, respectively.
+
+  If the terminal supports Unicode, you might try setting the value to
+  ` ['│', '─', '╭', '╮', '╯', '╰']`, to make it look nicer.
+
+
 g:ale_history_enabled                                   *g:ale_history_enabled*
 
   Type: |Number|