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https://issues.apache.org/jira/browse/NETBEANS-403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16608542#comment-16608542
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Eirik Bakke commented on NETBEANS-403:
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This bug seems to appear only on MacOS.

> Pressing Home/End scrolls to beginning/end of whole document if tooltip is 
> open
> -------------------------------------------------------------------------------
>
>                 Key: NETBEANS-403
>                 URL: https://issues.apache.org/jira/browse/NETBEANS-403
>             Project: NetBeans
>          Issue Type: Bug
>          Components: editor - Key bindings
>    Affects Versions: 8.2, 9.0
>            Reporter: Eirik Bakke
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HomeEndBug.png
>
>          Time Spent: 3.5h
>  Remaining Estimate: 0h
>
> When a tooltip is shown in the Java editor, for instance because the mouse is 
> hovering over an error indication, pressing the Home or End keys on the 
> keyboard scrolls the entire document all the way to the top or end, 
> respectively instead of to the beginning or end of the current line. This is 
> extremely disruptive, and likely very confusing to users, as it only happens 
> in the stated situation.
> A workaround is to move the mouse pointer away from the editor to close the 
> popup after examining an error. Most users will not be able to discover this 
> workaround, though--for myself, it took two weeks to discover the correlation 
> between the tooltip being open and the bug occurring.
> This bug seems to have been introduced in 8.2, and I justĀ confirmed that it 
> is still present on the new Apache NetBeans 9.0 beta release.
> This issue was first reported as issue #270842 by timothyrheider in the old 
> BugZilla tracker, on 2017-06-09:
> https://netbeans.org/bugzilla/show_bug.cgi?id=270842



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