Shading and unshading windows corrupts the tiling

[ilkerhk]

Symptom
Shading a window is not working as expected.

How to Reproduce

1. Start tiling with at least 2 windows
2. shade a window
3. When I shade a window (for example one located in the lower part of the screen), the remaining tiled windows do not resize. I can see the desktop under the previously shaded window.

Expected behavior
When a window is shaded the area under it should be used by the other windows.
Best solution (for me as a user) is that after the shading, the whole tiling and sizes of the windows should be updated (now shaded window has a little height, and should be tiled with this low height).
Or alternative solutions is that: shaded window should switch to floating mode (kwin-tiling script does that), and unshading should put it back into tiling.

Notes
thanks in advance.