Since upgrading to Sierra, clicking any text within PhpStorm 2016.2.1 results in a random block of text being selected and clicking within that moves the text around randomly instead of deselecting the text block.
Worked without a problem in El Capitan.
This has made PhpStorm into an extremely frustrating and productivity killing experience.
Any idea how to fix this?
I found that turning off the "three finger drag" feature dramatically reduced this issue.
Follow the instructions in Apple's support docs for this.
It seems that under Sierra the Magic Mouse has become so sensitive that even touching the edge of the mouse with my other fingers can be misinterpreted as a three finger drag attempt.
Still happens intermittently, so I'm hoping some update to the driver by Apple or the PHPStorm JDK will get rid of any lingering occurrences. For now, this is the best solution I've found thus far.