building from locator while building causes error

i'm seeing this glitch when building cmake projects

when i start the build, the project builds, and other build actions are disabled (ctrl-b is disabled, the 'build' button becomes a 'stop build' button.

however i can still use the locator bar (e.g. via a command `cm all`) to start a new build. in this case the build aborts with "Error while building/deploying". it would be great to either stop the build and restart with the new build command or disable starting new builds with `cm` (so that the currently running build won't be aborted)