Some Eclipse Foundation services are deprecated, or will be soon. Please ensure you've read this important communication.

Bug 509729

Summary: Moving Editor tab from one group to the next in a split editor view not working
Product: [Eclipse Project] Platform Reporter: Sam Gabriel <sgabriel>
Component: IDEAssignee: Platform-UI-Inbox <Platform-UI-Inbox>
Status: CLOSED WONTFIX QA Contact:
Severity: normal    
Priority: P3 CC: 214535763, dev.tom.menzel, Richard.Walker
Version: 4.7   
Target Milestone: ---   
Hardware: PC   
OS: Windows 10   
Whiteboard: stalebug

Description Sam Gabriel CLA 2016-12-27 13:54:59 EST
clipse Java EE IDE for Web Developers.

Version: Oxygen Release Milestone 4 (4.7.0 M4)
Build id: 20161215-0740
Windows 10 64bit
Java 8



I am used to having two windows of eclipse each with a two editor groups side by side. Recently i noticed that occasionally after working for sometime and even after restart. Dragging editor tabs from one group to the next in the same window doesn't work anymore. This is my usual flow specially when refactoring where I open two editors of two files next to each other. 

This started after a clean install of Oxygen M3 and then M4. It didn't happen in Neon or any other prior version of eclipse since 3.6.

No errors in the error log.
Comment 1 Sam Gabriel CLA 2016-12-27 13:58:36 EST
Oh I just found a workaround. Apparently it is because I disabled recycling of editors and there were more than 99 editors open on both tab groups. When I closed most of the editors it allowed me to drag and drop again. Hopefully this will be helpful to someone.
Comment 2 Sam Gabriel CLA 2016-12-27 14:00:55 EST
Nope I spoke too early. I was able to move one editor to the next tab group but after that can't move any other tabs. 

Only solution is to close the window completely and reopen a new one
Comment 3 Sam Gabriel CLA 2016-12-27 14:45:49 EST
Apparently whenever more than one window is opened. One of the windows always exhibit this behavior. You will not be able to move editor tabs from one tab group to the next in the same window.
Comment 4 Richard Walker CLA 2017-11-06 22:31:59 EST
(In reply to Sam Gabriel from comment #3)
> Apparently whenever more than one window is opened. One of the windows
> always exhibit this behavior. You will not be able to move editor tabs from
> one tab group to the next in the same window.

Confirmed the same behaviour in:

Version: Oxygen.1a Release (4.7.1a)
Build id: 20171005-1200
Mac OS 10.12.6
Java 8

I had two windows open; In one, I was able to toggle split vertical/horizontal, but this _only_ applied to the file currently selected: I was unable to get two side-by-side editors editing different files.

I _was_ able to do that in the other window. After closing _that_ window, I was able to go back to the original window and get side-by-side editors editing different files.
Comment 5 thomas menzel CLA 2017-12-01 19:13:00 EST
(In reply to Richard Walker from comment #4)
yep, ran into that today as well. very annoying b/c i had to recreate my WS froms cratch as upgrading didnt behave very well. 
i use ATM 6-7 windows on 2 displays on win7.

i also observed these behaviors:

i pushed one of the windows to the other display (running 2) and then it worked.
i noticed this, when i spanned the window over both screens and suddenly i would get the drop feedback.

D&D usually works on the last window opened but not the others. when i closed the last window, the now last one worked (after a restart).

it have the impression that some var is held in the wrong scope (eg. per WS instead of window).
Comment 6 thomas menzel CLA 2017-12-04 06:08:11 EST
FYI
the possibility to open new Windows on the same code base is one of the abilities that sets eclipse from intellij apart. It offers u to view the code/output from different angles simultaneously when working with >1 displays.  This is for me the main reasons to stay with eclipse.
Comment 7 scrong scrong CLA 2018-01-25 05:03:07 EST
now still has this problem
how to fix it?
Comment 8 Eclipse Genie CLA 2020-04-02 08:54:35 EDT
This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet. As such, we're closing this bug.

If you have further information on the current state of the bug, please add it and reopen this bug. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant.

--
The automated Eclipse Genie.