Eclipse windows will not dock on Ubuntu - eclipse

I'm running Eclipse Mars on Ubuntu 12.04 LTS and it seems impossible to dock windows in the IDE.
Normally, when you drag a tab to a border of the editor pane, it will dock within the pane. This makes it easy to work on several files at once. But as soon as I start to drag a tab, it creates a detached window. This window has no menu or toolbar and I can find no way to re-attach it to the main editor.
Can anyone suggest a way to make the Eclipse windows behave normally?

Seems like it was some kind of transient display problem. Closing Eclipse and rebooting fixed it. I guess I should have tried that first :S

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All windows dissapeared from STS after opening tag registry

It seems that all my window panes in workbench became irresponsible in STS when tried Window->Show view->Other->Tag registry.
Then after restart all panes become invisible/dissapeared.
I use Spring Tool Suite:
Version: 3.9.6.RELEASE
Build Id: 201809180749
Platform: Eclipse 2018-09 (4.9.0)
Clicking on the icons of the toolbar visible on the right side only hides window visible on the left. Panels/windows don't come back after restarting IDE.
The simplest solution would be to reset the Perspective from the Window menu.

How do I make a breakpoint in Eclipse Neon using GoClipse?

I have a GoClipse project in Eclipse Neon that I am attempting to debug. On my work computer I am able to create a new breakpoint by clicking on the left side of the code window, but on my home computer this is not working. Is there somthing that I do not have enabled on my home computer?
How do I make a breakpoint in Eclipse Neon using GoClipse?
Did you double click on the editor column? Or opened the context menu there? Just a single-click won't work.

Eclipse modal dialogs disappear under Ubuntu

I'm having a strange issue with the Eclipse IDE on Ubuntu.
When opening a modal dialog in eclipse and then switching to another tool, like my browser, and then switching back again, the modal dialog I had open seems to disappear.
Is there any way to get the dialog back into focus? This is quite annoying when the dialogs are modal. So far, the only way I can get it working again is to exit the IDE, and then open it again.
Thanks for helping.
This is a bug in Unity and is not limited to Eclipse - https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1584885.
Unfortunately the only workaround as mentioned in the comments is to close Eclipse - right-click on the Eclipse icon in the taskbar and select 'Quit' (you might have to do it more than once until Eclipse responds).
You could also upgrade to Ubuntu 18.04 which features GNOME instead of Unity.

How to move eclipse control panel to ubuntu top panel?

After playing with compiz tool in ubuntu 12.04 (changed opacity of ubuntu top panel) something gone wrong with my eclipse indigo. It won't display control panel in ubuntu top panel (default place for windows' controls) but takes whole next line under ubuntu panel. All other applications didn't change behavior. Does anyone know how to roll things back?

Drag files into NetBeans to open

I updated my Netbeans from version 7.0 to 7.1.2. One of the first things I noticed is that I can no longer drag files from my explorer window into netbeans to open it. Does anyone know why I can no longer do so? Or if you know of a setting or something to get this to work as it did in the previous version that would be great. I have scoured the internet for a solution but have not been able to find and answer.
EDIT
I had updated my version of NetBeans and it had worked for a couple weeks but no I am no longer able to open files by dragging them onto the IDE.
Hate to say this, but on my Windows 7 box "it just works". Try upgrading your netbeans to a newer installation.
I found the solution to my issue. It looks like if NetBeans is run as administrator then you are no longer able to drag and drop file to open them in the IDE. Turning that off fixed the problem for me.
To do this in Windows 7: right click the Netbeans icon > Properties > Compatibility tab > Change Settings for All Users > unclick "Run this program as an administrator"