When you run Build System is Sublime by default it creates a bottom pop-up that is bound to that sublime window. When you change to other tabs bottom pop-up will still stay for the Build that you have started.
I would like to have separate Build/Build pop-up for every tab that is opened in that window. For example; there are two tabs open, file01 and file02. I run Build System for file01 and while its running I switch to other tab, file02, and there is no Build pop-up. I can edit file02 and also run build on it separately while build on file01(tab one) is running. Also starting and stopping Builds for for different files will not affect Builds for other files/tabs. Essentially every tab in a window would have separate Build System and Build pop-up.