IDEA-100721 OptionsTree#findConfigurable doesn't work because most of configurables are instances of ConfigurableWrapper
IDEA-100722 Commenting block of Java code with EOL comments unfolds imports and top comment

Use bulk processing only when number of lines to be commented is relatively big. 'Relatively big' might be tweaked via 'idea.bulk.comment.lines.trigger' property. Default value is 100. We need that change because the whole bulk processing is implemented in a way 'drop all cached info on bulk change start; re-calculate all necessary info on bulk update end'. I.e. there is no point in recalculating everything when, for example, one line is commented
IDEA-100765 (note fsnotifier's sudden death when waiting)
Spellchecker IDEA-100509 slow on large files / Fixed perf - typo wrong string was used for pre-screening.
Spellchecker IDEA-100509 slow on large files / minor - get rid of couple interim strings