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bbfa235
(Get the code!)
Yes, this has been fixed quite a while ago. :-)
Online resize with flex_bg was fixed in 2012 --- call with the v3.10 kernel or so.
Offline resize was fixed around that time (e2fsprogs 1.43), but there have been some bugs with flex_bg and off-line resizing, so I'd recommend using at least e2fsprogs 1.44.x if you want to off-line resize file systems with flex_bg. And on-line resizing is actually going to be safer in general --- mainly because it's less capable --- the scary bits with off-line resizing are things that on-line resize can't do, like shrink the file system or move the inode table around to make room for more block group descriptors than were originally reserved at mkfs time.