How can I reproduce this error?
This is a special case of another problem. There also includes debugging scripts using PE-resources from the compiled applications, debugging script running as a service, debug interprocess communication scripts, etc. All this can be solved by debugging compiled script. The next version will have the opportunity to add to the source code debugger, which can then compile and debug in real conditions of use.
Browse the list is disabled by default, this speeds up the work of the debugger, if the script is paused variables can be viewed directly in the editor by placing the mouse over them, if you move the cursor to an empty list of variables appears tooltip - To automatically update expressions list, toggle button "Clear expressions list".
F8 - "Step Over Scope", first scope was a "Global", reaching 19 line steel in scope function "_test", the scope has changed - debugger stood pause.
Edit commands and expressions in the same place where they are displayed, saved in the ini-file, next to the script being debugged.
It concerned the debugger debugging and should not have any value to users.
This multi-line construction, during the execution of AutoIt transforms it into a single line, so the breakpoint is only possible on the first line of this design.