SublimeText is smart in Single-Click-Open mode, it reuse existing tab without open too many tabs.
In IntelliJ IDEA, when I choose "Auto Scroll To Source" mode in Navigation Pane, I will turn into a single-click-open mode:
Once I single-click a file in Navigation Pane, it will open a new editor tab for that file.
I click and click to view temporarily without edit, the result can be imagined: many editor tabs open, so i have to manually close them or switch between these temporary tabs and real editing files, that is tedious.
In Sublime Text, it is smart,
Single-click a file == it will reuse current tab if which is also opened by single-click and not changed.
Double-click a file == always open new tab
Single-click a file then change it == the tab will not be reused by other file