Sublime Text has no built-in way to do this. Although it is possible, the Sublime Text plugin could do this by combining the file update plugin in the forum with the Python equivalent for watchr .
This thread of the Sublime Forum asks how to make a file in another tab update automatically, given that Sublime Text is already in front. The assistant could not find a way to make Sublime Text like this, but as a workaround, he wrote a plugin that allows them to press a hot key to reload all open tabs.
You can try to solve this by the same principle by making a system-wide hotkey to switch to ST2 and vice versa. You can implement the AutoHotkey hotkey for Windows or Quicksilver or the Maestro Keyboard for Mac. This is not as good as automatic updating, but it is the next best. You can press the hotkey every time you expect the file to change.
You can even use a tool like watchr to track changes to files you plan to edit, and automatically run an AutoHotkey script or AppleScript that switches to Sublime Text and back when the file is updated. It would be even better to drop the GUI scripts and use the Sublime Text Python interface to reload the view without switching to it, but I don't know if Sublime Text can run Python in an application from within a program outside the application.
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