Spyder 4.0b1: cannot drag panes like in Spyder 3

Problem Description

A pane can be undocked, but it cannot be docked again in Spyder 4.0.0b1. I had to create a new env, install spyder 3 and create the layout I wished to have. After that it appeared in Spyder 4

What steps reproduce the problem?

1. Do a Spyder --reset
2. goto view and add two panes: the project explorer and the outline pane.
3. undock the outline pane and watch it become an autonomous separate window. This can be moved everywhere but not be docked.

What is the expected output? What do you see instead?

When clicking on undock in spyder 3 an outline is drawn around the undocked pane and it can be moved everywhere to be docked in a new position.

Paste Traceback/Error Below (if applicable)

No errors, it just does not work as expected.

Versions

• Spyder version: 4.0.0b1
• Python version: 3.6.8 (64 bits)
• Qt version: 5.9.6
• PyQt version: 5.9.2
• Operating System name/version: Ubuntu 18.04

Dependencies

pyflakes >=0.6.0  :  2.1.0 (OK)
pycodestyle >=2.3 :  2.5.0 (OK)
pygments >=2.0    :  2.3.1 (OK)
sphinx >=0.6.6    :  1.8.4 (OK)
rope >=0.9.4      :  0.12.0 (OK)
jedi >=0.11.0     :  0.13.3 (OK)
psutil >=0.3      :  5.5.0 (OK)
nbconvert >=4.0   :  5.3.1 (OK)
pandas >=0.13.1   :  0.24.1 (OK)
numpy >=1.7       :  1.16.0 (OK)
sympy >=0.7.3     :  None (NOK)
cython >=0.21     :  None (NOK)
qtconsole >=4.2.0 :  4.4.3 (OK)
IPython >=4.0     :  7.3.0 (OK)
matplotlib >=2.0.0:  3.0.2 (OK)
pylint >=0.25     :  2.2.2 (OK)

[ccordoba12]

The way to reorganize panes changed in Spyder 4. Now you have to go to the menu

View > Lock panes and toolbars

and make sure that that option is turned off. Then you could move panes around by dragging and dropping them from the top.

[dinya]

@ccordoba12

Thanks a lot!