buffers|tabs|lines: normalize unnamed buffers (more below):

- prioritize 'show_quickfix' over 'show_unlisted'
2 new actions:
  - buf_switch_or_edit
  - file_switch_or_edit

lua/fzf-lua/actions.lua

@@ -91,7 +91,8 @@ M.vimcmd_file = function(vimcmd, selected, opts)
     if not path.starts_with_separator(fullpath) then
       fullpath = path.join({opts.cwd or vim.loop.cwd(), fullpath})
     end
-    if vimcmd == 'e' and curbuf ~= fullpath
+    if vimcmd == 'e'
+        and curbuf ~= fullpath
         and not vim.o.hidden and
         utils.buffer_is_dirty(nil, true) then
         -- warn the user when trying to switch from a dirty buffer
@@ -194,22 +195,31 @@ M.file_switch = function(selected, opts)
   return true
 end
 
+M.file_switch_or_edit = function(...)
+  M.file_switch(...)
+  M.file_edit(...)
+end
+
 -- buffer actions
 M.vimcmd_buf = function(vimcmd, selected, _)
+  local curbuf = vim.api.nvim_get_current_buf()
   for i = 1, #selected do
     local bufnr = string.match(selected[i], "%[(%d+)")
     if bufnr then
       if vimcmd == 'b'
+        and curbuf ~= tonumber(bufnr)
         and not vim.o.hidden and
         utils.buffer_is_dirty(nil, true) then
         -- warn the user when trying to switch from a dirty buffer
         -- when `:set nohidden`
         return
       end
-      local cmd = vimcmd .. " " .. bufnr
-      local ok, res = pcall(vim.cmd, cmd)
-      if not ok then
-        utils.warn(("':%s' failed: %s"):format(cmd, res))
+      if vimcmd ~= "b" or curbuf ~= tonumber(bufnr) then
+        local cmd = vimcmd .. " " .. bufnr
+        local ok, res = pcall(vim.cmd, cmd)
+        if not ok then
+          utils.warn(("':%s' failed: %s"):format(cmd, res))
+        end
       end
     end
   end
@@ -258,6 +268,11 @@ M.buf_switch = function(selected, _)
   end
 end
 
+M.buf_switch_or_edit = function(...)
+  M.buf_switch(...)
+  M.buf_edit(...)
+end
+
 M.colorscheme = function(selected)
   local colorscheme = selected[1]
   vim.cmd("colorscheme " .. colorscheme)

lua/fzf-lua/providers/buffers.lua

@@ -48,8 +48,13 @@ local filter_buffers = function(opts, unfiltered)
     if opts.show_all_buffers == false and not vim.api.nvim_buf_is_loaded(b) then
       excluded[b] = true
     end
-    if not opts.show_quickfix and utils.buf_is_qf(b) then
-      excluded[b] = true
+    if utils.buf_is_qf(b) then
+      if opts.show_quickfix then
+        -- show_quickfix trumps show_unlisted
+        excluded[b] = nil
+      else
+        excluded[b] = true
+      end
     end
     if opts.ignore_current_buffer and b == __STATE.curbuf then
       excluded[b] = true
@@ -109,12 +114,10 @@ local function gen_buffer_entry(opts, buf, hl_curbuf)
   local leftbr = utils.ansi_codes.clear('[')
   local rightbr = utils.ansi_codes.clear(']')
   local bufname = string.format("%s:%s",
-    utils._if(#buf.info.name>0, path.relative(buf.info.name, vim.loop.cwd()), "[No Name]"),
-    utils._if(buf.info.lnum>0, buf.info.lnum, ""))
-  local is_qf = utils.buf_is_qf(buf.bufnr, buf.info)
-  if is_qf then
-    bufname = string.format("%s", is_qf==1 and "[Quickfix List]" or "[Location List]")
-  end
+    #buf.info.name>0 and
+      path.relative(buf.info.name, vim.loop.cwd()) or
+      utils.nvim_buf_get_name(buf.bufnr, buf.info),
+    buf.info.lnum>0 and buf.info.lnum or  "")
   if buf.flag == '%' then
     flags = utils.ansi_codes.red(buf.flag) .. flags
     if hl_curbuf then
@@ -234,12 +237,7 @@ M.buffer_lines = function(opts)
       end
     end
     if not bufname or #bufname==0 then
-      local is_qf = utils.buf_is_qf(bufnr)
-      if is_qf then
-        bufname = is_qf==1 and "[Quickfix List]" or "[Location List]"
-      else
-        bufname = "[No Name]"
-      end
+      bufname = utils.nvim_buf_get_name(bufnr)
     end
     for l, text in ipairs(data) do
       table.insert(items, ("[%s]%s%s%s%s:%s: %s"):format(

lua/fzf-lua/utils.lua

@@ -408,6 +408,24 @@ function M.winid_from_tab_buf(tabnr, bufnr)
   return nil
 end
 
+function M.nvim_buf_get_name(bufnr, bufinfo)
+  if not vim.api.nvim_buf_is_valid(bufnr) then return end
+  if bufinfo and bufinfo.name and #bufinfo.name>0 then
+    return bufinfo.name
+  end
+  local bufname = vim.api.nvim_buf_get_name(bufnr)
+  if not bufname or #bufname==0 then
+    local is_qf = M.buf_is_qf(bufnr, bufinfo)
+    if is_qf then
+      bufname = is_qf==1 and "[Quickfix List]" or "[Location List]"
+    else
+      bufname = "[No Name]"
+    end
+  end
+  assert(#bufname>0)
+  return bufname
+end
+
 function M.zz()
   -- skip for terminal buffers
   if M.is_term_buffer() then return end