Re-add BufEnter autocmd and handle tmux bug

Fixes #19

autoload/presence.vim

@@ -8,6 +8,7 @@ function presence#SetAutoCmds()
             autocmd VimLeavePre * lua package.loaded.presence:handle_vim_leave_pre()
             autocmd WinEnter * lua package.loaded.presence:handle_win_enter()
             autocmd WinLeave * lua package.loaded.presence:handle_win_leave()
+            autocmd BufEnter * lua package.loaded.presence:handle_buf_enter()
             autocmd BufAdd * lua package.loaded.presence:handle_buf_add()
         endif
     augroup END

lua/presence/init.lua

@@ -863,6 +863,13 @@ end
 function Presence:handle_focus_gained()
     self.log:debug("Handling FocusGained event...")
 
+    -- Skip a potentially extraneous update call on initial startup if tmux is being used
+    -- (See https://github.com/neovim/neovim/issues/14572)
+    if next(self.last_activity) == nil and os.getenv("TMUX") then
+        self.log:debug("Skipping presence update for FocusGained event triggered by tmux...")
+        return
+    end
+
     if vim.bo.filetype == "qf" then
         self.log:debug("Skipping presence update for quickfix window...")
         return
@@ -921,6 +928,18 @@ function Presence:handle_win_leave()
     end)
 end
 
+-- BufEnter events force-update the presence for the current buffer unless it's a quickfix window
+function Presence:handle_buf_enter()
+    self.log:debug("Handling BufEnter event...")
+
+    if vim.bo.filetype == "qf" then
+        self.log:debug("Skipping presence update for quickfix window...")
+        return
+    end
+
+    self:update()
+end
+
 -- WinLeave events cancel the current buffer presence
 function Presence:handle_buf_add()
     self.log:debug("Handling BufAdd event...")