new option: close windows displaying removed files (#1300)

doc/nvim-tree-lua.txt

@@ -223,6 +223,9 @@ Values may be functions. Warning: this may result in unexpected behaviour.
             },
           },
         },
+        remove_file = {
+          close_window = true,
+        },
       },
       trash = {
         cmd = "trash",
@@ -672,6 +675,10 @@ Configuration for various actions.
           `buftype  = { "nofile", "terminal", "help", }`
         `}`
 
+    *nvim-tree.actions.remove_file.close_window*
+    Close any window displaying a file when removing the file from the tree.
+      Type: `boolean`, Default: `true`
+
     *nvim-tree.actions.use_system_clipboard*
     A boolean value that toggle the use of system clipboard when copy/paste
     function are invoked. When enabled, copied text will be stored in registers