ID 434054 - Custom palettes disappear when exiting fullscreen mode of a docked palette.

Problem summary
Custom palettes disappear when exiting fullscreen mode of a docked palette.

Customer reported version
mari.4.6v3

Customer reported platform
windows10

Steps to reproduce

1) From Mari, open any project.

2) From the Tools menu on the right, select any palette, then click+drag it away to undock it.

3) Select any additional tool to open it and click+drag it to the newly undocked palette to create a custom palette.

4) Open any other palette from the tools menu.

5) Click inside of the palette and press spacebar to fullscreen the palette.

6) Press spacebar again, observing behavior of the custom palette(s).

Expected behavior
The custom palettes should remain open in their respective positions when closing a fullscreen docked palette.

Actual behavior
The custom palettes disappear and get reset for their positions when exiting fullscreen mode of a docked palette.

Workaround
There is no available workaround at this time.

Reproduced by Support in
Mari 4.6v3 - Windows 10

Mari 4.6v1 - Windows 10

Mari 4.5v1 - Windows 10

Mari 4.0v1 - Windows 10

Unable to reproduce bug in:
Mari 3.4.v4 - Windows 10

Earliest version tested
Mari 3.4v4 - This feature did not exist before this version