EDU-124 added opportunity to copy from task text
Merge remote-tracking branch 'origin/master'
validation changed: invalid target rendered as error_text
Provide cancel editing for repository targets.

* target changed successfully only whe editing stopped and reverted to previous value if editing cancelled;
* targetChanged event handling simplified:  unnecessary parameter 'value' removed
highlight unused LowMemoryWatcher.register call results
and create a less error-prone overload with parentDisposable
cglib: don't override jdk 8 default methods as it causes jre to go crazy
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Merge remote-tracking branch 'origin/master'