Add backtraces to popper, enable project grouping

thoom-emacs/modules/thoom-tweaks.el

@@ -143,9 +143,11 @@
         '("\\*Messages\\*"
           "Output\\*$"
           "\\*Async Shell Command\\*"
+          "\\*Backtrace\\*"
           help-mode
           magit-status-mode
           compilation-mode))
+  (setq popper-group-function #'popper-group-by-project)
   (popper-mode +1)
   (popper-echo-mode +1))