Sorry but this will very likely never happen unless you do it yourself
together with other interested people and manage it on Github as a
community project. Google (GWT's main committer) invests in J2CL + Closure
Compiler in the future so they won't do it and current contributors will
likely favor SDM and don't want to manage a custom chrome build (at least
that is my impression).
I think you never really dived into SuperDevMode. Take GWT 2.8, start SDM
with -style PRETTY and disable sourcemaps in Chrome to see the real JS. Now
search for any method name and take a look how GWT sets up classes and
methods in JS. Once you understand that (really easy to understand the
basics) you can easily find what you are interested in, use watch
expressions and set conditional break points. You can also hover variables
to see their content if you do not use sourcemaps. Given that GWT doesn't
really optimize the JS code all the Java methods in your project will look
pretty similar in JS. If J2CL plays out nicely and GWT 3 will be build
around it, then the generated JS will likely even more look like Java as it
disadvantages) during development will be questionable.
DevMode had its time, I never really missed it. It's slower than SDM, you
can not use it do develop directly on mobile devices (granted with SDM and
a certain app size its also not possible because the SDM JS is so large
that it crashes the mobile browser), DevMode had executed Java code in JVM
which sometimes had different behavior than the compiled JS which could
lead to bugs in production you can't reproduce in development unless you
compile your app. IMHO SuperDevMode is superior to DevMode once you make
yourself comfortable with Chrome and its DevTools.
The only sad thing is that SDM still has some hard to reproduce bugs that
every now and then show up during development which require you to cleanup
the cache and start fresh.
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