[Issue Report]: Opening/closing speedbook closes all panels

[neube3]

Operating System

Windows x64

DevilutionX version

1.5.5

Describe

I've just tried to do some inventory management and Speedbook/spellbind management and discovered that opening/closing mechanic of these two windows doesn't make much sense.

Possibly inherited from vanilla, but I didn't check.

I've later re-checked and inventory can be swapped to spellbook ("B" in default original binds), meaning any right-side panel. Then I've re-checked again and it turns out quests and character (or having two panels open) is exactly the same.

To Reproduce

Four testing scenarios:

1. Open speedbook, open any panel -> both are open
2. Open any panel(s), open speedbook -> panel(s) get closed, speedbook is open
3. Open speedbook, open any panel(s), close any panel(s) -> speedbook is open, any panels not closed are open
4. Open speedbook, open any panel(s), close speedbook -> speedbook and all open panels close

I think the scenarios 2 and 4 are not what a user would expect (incongruency given scenarios 1 and 3).

I know it is possible to close speedbook without closing the panels, because that's what happens when you click any skill/spell - only the speedbook closes then.

Expected Behavior

Scenario 2: keep both inventory and speedbook open; scenario 4: keep inventory open.

Additional context

This happens only when the speedbook is opened via keybind.

Clicking on the currently selected spell to open/close the speedbook is not affected.