C++

compiler-explorer/compiler-explorer#3515 allowed the site to load even if the long url is not deserializable, but currently the site just silently fails and displays the default config.

It would be great if a notification could be shown to the user with a helpful message when this happens.
The steps needed to implement this feature are:

1. In the catch added by the lin

This is an Easy Hack.
Potential mentors: @mmeeks

Detailed description and rationale

We have a lot of duplication in Makefile.am around the run: rules to take just two for example:

run: setup-wsd
./loolwsd --o:sys_template_path="@SYSTEMPLATE_PATH@"
--o:security.capabilities="$(CAPABILITIES)"
--o:child_root_path=

I was wondering if we could have a Stopwatch that starts as soon as the user clicks on the problem. This will help the user improve his/her timing which might matter to him/her. The time required will only be stored for a particular session, and not forever (so no username/password required). To end the timer, the time of submission on CF can be used.