errael opened a new issue, #4437:
URL: https://github.com/apache/netbeans/issues/4437
### Apache NetBeans version
Apache NetBeans 14
### What happened
I encountered this problem with the output window detached from the `main
NetBeans Window` and **focus-follows-mouse** is set in the linux the window
manager. While editing, I moved the mouse from editor to detached window, when
the detached window gets focus the _undo/redo buttons go inactive_, move the
mouse back to the editor and the _buttons remain inactive_ although I can
edit/save as usual.
### How to reproduce
As described in **What happened**
### Did this work correctly in an earlier version?
No / Don't know
### Operating System
Linux harmony 5.18.10-76051810-generic
#202207071639~1657252310~22.04~7d5e891 SMP PREEMPT_DYNAMIC Fri J x86_64 x86_64
x86_64 GNU/Linux
### JDK
8,11,17
### Apache NetBeans packaging
Own source build
### Anything else
As a workaround, in a `JEditorPane`'s `focusListener.focusGained`, I've
essentially got:
```
TopComponent tc = NbEditorUtilities.getOuterTopComponent(getEditor());
if(tc != TopComponent.getRegistry().getActivated())
tc.requestActive();
```
where getEditor() is like `FocusEvent.getComponent()`.
For NetBeans, perhaps something like this
```
Mode m = WindowManager.getDefault().findMode(tc);
if(m != null)
central.setActiveMode(m);
```
in MainWindow's windowListener (but without proper exerience in
core.windows, I'd be hesitant to make changes in this area) or maybe a focus
listener with something like the workaround I'm using above in an editor's
`TopComponent`.
Relevant stack when moving mouse to detached window
```
at
org.netbeans.core.windows.WindowManagerImpl.notifyRegistryTopComponentActivated(WindowManagerImpl.java:1199)
at org.netbeans.core.windows.Central.setActiveMode(Central.java:233)
at
org.netbeans.core.windows.Central.userActivatedModeWindow(Central.java:1883)
at
org.netbeans.core.windows.view.DefaultView.userActivatedModeWindow(DefaultView.java:654)
at
org.netbeans.core.windows.view.ui.DefaultSeparateContainer$SharedModeUIBaseImpl$1.windowActivated(DefaultSeparateContainer.java:455)
at
java.awt.AWTEventMulticaster.windowActivated(AWTEventMulticaster.java:398)
```
### Are you willing to submit a pull request?
No
### Code of Conduct
Yes
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