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https://issues.apache.org/jira/browse/NETBEANS-5728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17439510#comment-17439510
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Eirik Bakke commented on NETBEANS-5728:
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(I have a workaround for this one but haven't yet made a PR of it...)
> ETable/OutlineView drag-and-drop selects spurious nodes
> -------------------------------------------------------
>
> Key: NETBEANS-5728
> URL: https://issues.apache.org/jira/browse/NETBEANS-5728
> Project: NetBeans
> Issue Type: Improvement
> Components: platform - Outline&TreeTable
> Affects Versions: 12.2
> Environment: Primarily MacOS, but also occasionally on Windows.
> Reporter: Eirik Bakke
> Priority: Major
>
> In an OutlineView with multiple selection enabled, if the user tries to drag
> one row to a different position (e.g. to reorder rows when the underlying
> nodes support it), additional rows will be selected as the mouse moves over
> them during the drag operation. On MacOS, it happens 100% of the time. On
> Windows, I've seen this bug happen in the past as well, though much less
> frequently. On Windows the bug is merely annoying, but on MacOS the bug makes
> OutlineView's drag-and-drop feature unusable.
> To reproduce:
> 1) One place in the IDE where the OutlineView is used is the "Search Results"
> tab. While this node tree doesn't really support reordering results, the
> OutlineView can still be used to exhibit the bug. Open some project,
> right-click the project node, click "Find..." and search for something that
> will bring up multiple (~5 or more) results.
> 2) Drag the first result row a couple of rows down, holding the left mouse
> button down to observe the bug. If the bug does not appear, let go and try
> again until it does. On Windows, you may need to start dragging from the
> lower part of the row you're trying to drag, and the dragged mouse cursor may
> need to exit onto the next row within a certain time period from when the
> left mouse button was pressed. On MacOS, the bug happens every time,
> regardless of how long I wait hovering over the original row while holding
> down the mouse button before beginning to drag across other rows.
> Because the bug appears in both Windows and MacOS, albeit more rarely on
> Windows, I suspect a fix that works in Windows would also fix the issue on
> MacOS. Because of the timing aspect when reproducing the bug in Windows,
> there appears to be some kind of race condition. Maybe there's some kind of
> "selection rectangle" concept that doesn't get properly turned off in the
> OutlineView.
> The problem is in JTable (see
> https://stackoverflow.com/questions/5969258/how-to-make-jtable-click-on-unselected-do-a-drag-instead-of-a-select
> ), but can be worked around in OutlineView.
> (This report is a revival of the old BugZilla issue
> https://bz.apache.org/netbeans/show_bug.cgi?id=230690 )
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