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If the several cursors are placed at the same position, there is no way how to separate them again. But the cursors behaves still as several input points. E.g. when typing a character, the character is inserted several times. IMHO It would be better in such case to join the cursors into one again.
Yesterday I've integrated a fix that should eliminate duplicate carets at one offset. Not sure on which build you've tested but for an older build it would be good to re-test on today's build. Thanks.
Today I've tested NetBeans IDE Dev (Build 201603220001) and the joining cursors is there. Thanks I've found only one problem - if the cursors are joined by "backspace" operation the joining did not work. Steps to reproduce: 1) put first cursor somewhere in the text 2) put second cursor two characters behind the first one 3) press backspace twice so the cursors are at same position -> they are not merged, character are inserted twice.