Stop terminating "attached" debugees

When attaching to an already running process, you typically want to
temporarily inspect the process, but you do not want to manage the
process' lifetime. The exit callback currently terminates all sessions
and their debugees.

    autocmd ExitPre * lua require('dap')._vim_exit_handler()

This commit changes the exit handler such that it disconnects from
"attached" debugees without terminating them.

Author: NSteinhoff

lua/dap.lua

@@ -1034,11 +1034,15 @@ end
 
 function M._vim_exit_handler()
   for _, s in pairs(sessions) do
-    terminate(s)
-    vim.wait(500, function()
-      ---@diagnostic disable-next-line: redundant-return-value
-      return session == nil and next(sessions) == nil
-    end)
+    if s.config.request == "attach" then
+      s:disconnect({ terminateDebuggee = false })
+    else
+      terminate(s)
+      vim.wait(500, function()
+        ---@diagnostic disable-next-line: redundant-return-value
+        return session == nil and next(sessions) == nil
+      end)
+    end
   end
   M.repl.close()
 end