A few tweaks to this little tool I added yesterday. These tweaks are so
that bugs like #5625 and #5636 are less likely to occur due to extreme
scaling.
Now, for action strips added using this:
* Auto-calculation of action range is disabled for that strip
* Strip Start and Action Start are set to the current frame value, when the
strip was added
* Strip End and Action End are set to either the end frame value or 100
frames after the current frame value, whichever is higher.
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