fix(files): avoid closing directory buffer when #windows decreases

lua/mini/files.lua

@@ -922,11 +922,6 @@ MiniFiles.close = function()
   -- Trigger appropriate event
   H.trigger_event('MiniFilesExplorerClose')
 
-  -- Focus on target window
-  explorer = H.explorer_ensure_target_window(explorer)
-  -- - Use `pcall()` because window might still be invalid
-  pcall(vim.api.nvim_set_current_win, explorer.target_window)
-
   -- Update currently shown cursors
   explorer = H.explorer_update_cursors(explorer)
 
@@ -951,6 +946,11 @@ MiniFiles.close = function()
   H.explorer_path_history[explorer.anchor] = explorer
   H.opened_explorers[explorer.tabpage_id] = nil
 
+  -- Focus on target window
+  explorer = H.explorer_ensure_target_window(explorer)
+  -- - Use `pcall()` because window might still be invalid
+  pcall(vim.api.nvim_set_current_win, explorer.target_window)
+
   -- Return `true` indicating success in closing
   return true
 end
@@ -1427,6 +1427,9 @@ H.track_dir_edit = function(data)
   if vim.api.nvim_get_current_buf() ~= data.buf then return end
 
   if vim.b.minifiles_processed_dir then
+    -- Only delete directory buffer explicitly when explorer is closed
+    if H.explorer_get() ~= nil then return end
+
     -- Smartly delete directory buffer if already visited
     local alt_buf = vim.fn.bufnr('#')
     -- - Setting alternative buffer is enough for the "directory buffer" to be

tests/test_files.lua

@@ -6369,6 +6369,32 @@ T['Default explorer']['handles forcing other window as current'] = function()
   if child.fn.has('nvim-0.10') == 1 then eq(child.api.nvim_get_current_win(), init_win_id) end
 end
 
+T['Default explorer']['keeps directory buffer open when number of windows decreases'] = function()
+  local validate = function(fn_str)
+    child.cmd('edit ' .. make_test_path('nested'))
+
+    local buffers = child.api.nvim_list_bufs()
+    local dir_buffer_id = buffers[1]
+    eq(child.fn.isdirectory(child.api.nvim_buf_get_name(dir_buffer_id)), 1)
+
+    go_in()
+    go_in()
+    child.lua(fn_str)
+
+    -- Assert directory buffer still present
+    eq(child.api.nvim_buf_is_valid(dir_buffer_id), true)
+    -- Assert directory buffer deleted
+    close()
+    eq(child.api.nvim_buf_is_valid(dir_buffer_id), false)
+  end
+  -- Ensure enough space for 3 windows
+  child.set_size(5, 90)
+  -- Shrink number of windows using refresh
+  validate('MiniFiles.refresh({ windows = { max_number = 1 } })')
+  -- Shrink number of windows using trim_left
+  validate('MiniFiles.trim_left()')
+end
+
 T['Internal helpers'] = new_set()
 
 T['Internal helpers']['path normalization works'] = function()