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On OSX, starting 7.0 or so we have this new feature where Command + Up/Down mouse scroll will increase/decrease the editor font size. This is annoying for me because I always trigger this accidentally. What I do is use Command+Tab all the time to switch between applications. And on OSX you have this nice feature that if you mouse scroll Up/Down while that list of apps is displayed, you can easily switch between apps. So, what I do is Command+Tab then scroll Up/Down and then I release the keys and OSX switches to the other app. Anyhow, the problem seems to be that if I release the Tab too early and I'm still scrolling, on OSX this will be detected by NetBeans as Command + Scroll Up and increase my font size! I don't know how this could be fixed but NetBeans is the only app where this shows up. Maybe something like a small delay after NetBeans becomes the top window to give me time to release Command :-) ?
*** This bug has been marked as a duplicate of bug 212484 ***