Open Radar

 
Summary:
Hi!  Looks like Xcode9b1 took out (or hasn't added back in) command-control-M, which toggles the visiblity of warnings and errors, as well as row colorization.

command-control-M is my favorite Xcode 8 keyboard shortcut because I find the in-your-face errors to be distracting (and also an accessibility issue - saturated colors like the red backgrounds and icons interact badly with the chromatic aberration in my eyeglasses.

Steps to Reproduce:
* Have some errors (maybe a metric freakload due to a big refactor)
* see the errors in your editor
* Make them go away, say with Xcode 8's command-control-M keystroke

Expected Results:
The errors are hidden and I can edit without a headache

Observed Results:
Beep

Version:
Version 9.0 beta (9M136h)
10.12.5 (16F73)

Notes:
In general, sufficiently advanced developers don't need a huge amount of hand-holding. It'd be nice to be able to turn highly-visibile hand-holding off somehow.

Thanks!

Configuration:
Works great in Xcode 8.x and all prior version.  Doesn't work with Xcode 9