Refactor and fix issues in Editor Dock Manager

[kitbdev]

• Fixes Crash on Show in Filesystem when FileSystem is at the bottom #88000
• Fixes Editor: Out of bounds error in one of TabBars when you have floating docks #87234
• Fixes Dock position widget never disappears after changing position of a dock #74215
• Fixes crash when disabling the Filesystem in Editor Features when it is at the bottom. (related: Godot crashes when changing Editor Features when certain docks are floating #84125)
• Fixes both // FIXME: Find it, in a horribly inefficient way. in EditorDockManager::load_docks_from_config()
• Fixes // FIXME: Close all floating docks to avoid crash. in EditorNode::_feature_profile_changed() from Fix dock visibility issues #84122
  • removed close_all_floating_docks()
• Fixes dock select popup drawing issues with scaling, sizes, and rtl.
• Fixes dock names being untranslated when moving to floating window or to bottom panel.
• Fixes clicking on the signals or group button in the Scene Tree Dock while the Node dock is floating shows errors.
• related Extract EditorDockManager from EditorNode #84193

Implementation Details

EditorDockManager

• Added DockInfo struct and a HashMap<Control *, DockInfo> of all docks to be able to easily access information on docks.
  • This replaces the bottom_docks Vector.
• Replaced _edit_current() with _update_layout() to handle all updating that needs to happen after any dock moves. Previously some actions like floating a dock wouldn't save the layout, so it wouldn't restore if a crash occurs.
• Docks disabled with Editor features are moved out of the dock and hidden, instead of using hidden tabs. They use set_dock_enabled() which sets a flag and closes or opens the dock.
• close_dock() will hide the dock and move it out of the tab container, so it doesn't affect anything and isn't seen in the dock menu. open_dock() will restore the dock to its previous location. These will also be useful for Allow opening and closing any editor dock godot-proposals#8206
• Saving a closed disabled dock will still add it to a slot so we know where to restore it to after loading, just like floating windows.
• Saving bottom docks was changed to do the same so it is more like closed and floating docks. This means that previous layouts with a bottom dock will need to be resaved.
• Simplified and made private _update_dock_slots_visibility() because hidden tabs no longer need to be checked.
• Added _move_dock() to handle moving the dock, to make sure it is always properly handled when removed from the bottom panel or a floating window, and making sure the title is set when moving to a TabContainer.
• focus_dock() handles focusing on a dock no matter where it is.

Extracts the dock popup into its own class DockContextPopup. (#84193 (comment))

• It now operates on a dock Control, rather than indexes for the dock and bottom panel item.
• Added tooltips for the L/R move tab buttons.
• The docks are drawn now at the appropriate position when in rtl.
• Editor scale is now used for tab drawing.
  • Before (150%):
    
  • After (150%):
    
• Size issues when buttons were added/removed are fixed.
  • Before:
    
  • After:
    
• Docks at the bottom panel can now float directly (Allow to move FileSystem dock to bottom and drag resources across bottom docks #86765 (comment)).
• Tabs can be right clicked to open the popup.

[kitbdev]

Changes:

• Removed the layout_changed signal and instead use save_editor_layout_delayed(). This prevents unnecessarily saving multiple times in a row. This saving is only really in case of a crash, and it doesn't need to happen immediately.
• _dock_container_update_visibility() replaces _update_dock_slots_visibility(), and it just updates the one tab container's visibility when it is needed, when a child is added or removed.
• set_docks_visible() handle updating the dock slots visibility itself.
• Connected dock slots to active_tab_rearranged to make sure layout is updated when dragging a tab within itself.
• Made sure _update_layout() only happens once after docks have been moved.
• Changed DockInfo name to title to be more accurate and better distinguish from when the Control's name is used instead.
• Fix Bottom Dock context menu position when not in fullscreen.
• Load layout doesn't need to update layout because the layout will be saved after it is called.
• Rebased.

Does EditorNode::edit_current() need to be called whenever the layout changes?
I have it there because it was being called when the layout changed in some cases, but I don't know if it is actually needed.

[kitbdev]

Rebased to fix merge conflicts.
Shortcut is now saved in dock info instead of in the meta.
Also fixed to show translated dock title in floating window.

[KoBeWi]

Looks great overall.

[akien-mga]

Thanks!