add `user_startup_commands` variable that may contain tcl code to be executed after any new window creation. Useful to have custom bindings / menu / buttons in all windows.

src/xinit.c

@@ -1666,6 +1666,7 @@ static void create_new_window(int *window_count, const char *noconfirm, const ch
   tclvareval("set_bindings ", window_path[n], NULL);
   tclvareval("set_replace_key_binding ", window_path[n], NULL);
   tclvareval("save_ctx ", window_path[n], NULL);
+  tcleval("eval_user_startup_commands");
   /* restore previous context,
    * because the Expose event after new window creation does a context switch prev win -> new win 
    * 
@@ -2892,6 +2893,7 @@ int Tcl_AppInit(Tcl_Interp *inter)
  if(has_x) {
    tclsetintvar("tctx::max_new_windows", MAX_NEW_WINDOWS);
    tcleval("pack_widgets; set_bindings .drw");
+   tcleval("eval_user_startup_commands");
  }
 
  fs=tclgetintvar("fullscreen");

src/xschem.tcl

@@ -9355,6 +9355,15 @@ proc source_user_tcl_files {} {
   }
 }
 
+proc eval_user_startup_commands {} {
+  global user_startup_commands
+  if {[info exists user_startup_commands]} {
+    if {[catch {uplevel #0 $user_startup_commands} res]} {
+      puts "executing $user_startup_commands:\n\n$res"
+    }
+  }         
+}           
+
 proc eval_postinit_commands {} {
   global postinit_commands
   if {[info exists postinit_commands]} {

src/xschemrc

@@ -540,6 +540,17 @@
 #   }
 # }
 
+###########################################################################
+#### TCL COMMANDS TO BE EXECUTED AFTER ANY NEW WINDOW CREATION
+###########################################################################
+#### this hook is useful to execute user UI code (like event binding,
+#### new buttons / menu entries etc).
+# set user_startup_commands {
+#   bind [xschem get current_win_path] <Key-plus>  {
+#     puts Hello
+#   }
+# }
+
 ###########################################################################
 #### TCL COMMANDS TO BE EXECUTED AFTER GENERATING NETLIST
 ###########################################################################