fix: foldclosed for inactive buffers

lua/ibl/init.lua

@@ -267,7 +267,7 @@ M.refresh = function(bufnr)
         end
 
         local whitespace = utils.get_whitespace(line)
-        local foldclosed = vim.fn.foldclosed(row)
+        local foldclosed = utils.get_foldclosed(bufnr, row)
         if is_current_buffer and foldclosed == row then
             local foldtext = vim.fn.foldtextresult(row)
             local foldtext_whitespace = utils.get_whitespace(foldtext)

lua/ibl/utils.lua

@@ -170,6 +170,7 @@ M.has_end = function(line)
 end
 
 ---@param bufnr number
+---@return number, number, number, number
 M.get_offset = function(bufnr)
     local win
     local win_view
@@ -198,6 +199,24 @@ M.get_offset = function(bufnr)
     return win_view.leftcol or 0, win_view.topline or 0, win_end, win_height
 end
 
+---@param bufnr number
+---@param row number
+---@return number
+M.get_foldclosed = function(bufnr, row)
+    if bufnr == vim.api.nvim_get_current_buf() then
+        return vim.fn.foldclosed(row) or -1
+    else
+        local win = M.get_win(bufnr)
+        if not win then
+            return -1
+        end
+        return vim.api.nvim_win_call(win, function()
+            ---@diagnostic disable-next-line: redundant-return-value
+            return vim.fn.foldclosed(row) or -1
+        end)
+    end
+end
+
 ---@param bufnr number
 ---@param config ibl.config
 M.is_buffer_active = function(bufnr, config)