Frequent freezes with cut/copy

[mickaelistria]

Often with Ctrl+C or Ctrl+X, I get

"main" #1 [77645] prio=6 os_prio=0 cpu=486005,00ms elapsed=2624,24s tid=0x00007fde8002f2c0 nid=77645 in Object.wait()  [0x00007fde857fa000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
	at java.lang.Object.wait0([email protected]/Native Method)
	- waiting on <no object reference available>
	at java.lang.Object.wait([email protected]/Object.java:378)
	at org.eclipse.jdt.core.manipulation.CoreASTProvider.getAST(CoreASTProvider.java:176)
	- locked <0x0000000619c56ba0> (a java.lang.Object)
	at org.eclipse.jdt.core.manipulation.CoreASTProvider.getAST(CoreASTProvider.java:189)
	at org.eclipse.jdt.core.manipulation.CoreASTProvider.getAST(CoreASTProvider.java:189)
	at org.eclipse.jdt.core.manipulation.CoreASTProvider.getAST(CoreASTProvider.java:189)
	at org.eclipse.jdt.core.manipulation.SharedASTProviderCore.getAST(SharedASTProviderCore.java:138)
	at org.eclipse.jdt.internal.ui.javaeditor.ClipboardOperationAction.getClipboardData(ClipboardOperationAction.java:488)
	at org.eclipse.jdt.internal.ui.javaeditor.ClipboardOperationAction.doCutCopyWithImportsOperation(ClipboardOperationAction.java:409)
	at org.eclipse.jdt.internal.ui.javaeditor.ClipboardOperationAction.internalDoOperation(ClipboardOperationAction.java:368)
	at org.eclipse.jdt.internal.ui.javaeditor.ClipboardOperationAction$$Lambda/0x00007fde043e7008.run(Unknown Source)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
	at org.eclipse.jdt.internal.ui.javaeditor.ClipboardOperationAction.run(ClipboardOperationAction.java:289)

and indeed, it seems to be waiting on... nothing; I cannot find in jstack any other thread doing JDT stuff.

[mickaelistria]

Looks like another case making the freeze highly probably is when trying to complete final