Enabling both trim_trailing_white_space_on_save and save_on_focus_lost leads to somewhat unpleasant behavior. For example, I'm editing a python file and I've got the cursor on a new line (properly indented to 3-4 tabs/4-space groups), or I've just started writing an assignment (with something like foo = <cursor> in the editor). If I switch to some other app and then switch back, cursor will jump to the beginning of line or erase whatever spaces I had at the end of current line, and then I'll have to reinsert these spaces manually. This is even more annoying if this is the last line and ensure_newline_at_eof_on_save is also set — the cursor is forcibly moved to the next line whenever you cmd-tab. I understand that ST doesn't support virtual whitespace (hopefully it will do in the future), but perhaps you could add some hack to fix this specific issue?
Customer support service by UserEcho