[Feature] Save window layout to `.atta`

[brenocq]

Feature description

Currently, Atta does not save the state (position, size, docking status) of the ImGui windows used within the editor. Every time a project is opened, the window layout resets to its default configuration. This requires users to manually rearrange their workspace repeatedly, which can be inefficient and annoying, especially for projects that rely on specific ImGui windows for visualization or debugging tasks.

This feature proposes saving the ImGui window layout configuration directly within the project's .atta file. When a project is saved, the current layout of all ImGui windows should be stored. When the project is subsequently opened, Atta should restore the windows to their saved positions, sizes, and docking states.

This will provide a persistent workspace for users, improving workflow efficiency. ImGui itself provides mechanisms for saving and loading window states (often to an imgui.ini file), which could potentially be leveraged or adapted for integration with the .atta file format.

Tasks

• Study ImGui Ini settings
• Study ImGui window internal API
• Disable creation of detached window by ImGui
• Organize Atta dockspace
• Improve top bar "Window" menu
  • Option to show/hide module windows
  • Option to show/hide editor windows
• Improve top bar "Help" item
  • Report a bug
  • Suggest a feature
  • Gallery
  • Q&A
• Determine which window data to store in .atta
• Get ImGui window data
• Serialize ImGui window data to .atta
• Deserialize ImGui window data from .atta
• Make sure the initial layout is correct when no layout is stored in .atta
• Make sure layout is initialized when switching between Vulkan/OpenGL
• Fix Atta crashing when the window is resized

[brenocq]

This is my current plan to store ImGui's window layout in the .atta such that the window docking/size/etc persists. A new [window] tag will be added to .atta with the information below

[brenocq]

A bit off topic, but I added a status bar so the user can easily see which atta version they are using. It is possible to click on the version number to open the release description

[brenocq]

The Window menu has been enhanced so that users can now toggle the visibility of any Atta window. In addition, newly created windows (previously always floating) can now be assigned a default docking node directly in code.

Atta default docking nodes

Window menu item

Before	After

[brenocq]

Printing some data from ImGuiContext::Windows, nice to see which windows were created under the hood

[ui::Manager] getWindowInfosImpl() is not implemented yet.
[ui::Manager] Window: WindowOverViewport_11111111 (pos vec2{0.000000, 22.000000} size vec2{1600.000000, 878.000000})
[ui::Manager] Window: WindowOverViewport_11111111/DockSpace_1C49D4FE (pos vec2{0.000000, 22.000000} size vec2{1600.000000, 878.000000})
[ui::Manager] Window: ##AttaToolBar (pos vec2{0.000000, 22.000000} size vec2{1342.000000, 32.000000})
[ui::Manager] Window: ##AttaStatusBar (pos vec2{0.000000, 880.000000} size vec2{1600.000000, 20.000000})
[ui::Manager] Window: Main Viewport###AttaViewport::Viewport 0 (pos vec2{0.000000, 56.000000} size vec2{1342.000000, 644.000000})
[ui::Manager] Window: Scene##Atta (pos vec2{1344.000000, 22.000000} size vec2{256.000000, 856.000000})
[ui::Manager] Window: Output##Atta (pos vec2{0.000000, 702.000000} size vec2{1342.000000, 176.000000})
[ui::Manager] Window: gizmo (pos vec2{0.000000, 0.000000} size vec2{1600.000000, 900.000000})
[ui::Manager] Window: Debug##Default (pos vec2{60.000000, 60.000000} size vec2{400.000000, 400.000000})
[ui::Manager] Window: Dear ImGui Demo (pos vec2{650.000000, 20.000000} size vec2{550.000000, 680.000000})
[ui::Manager] Window: ##Menu_00 (pos vec2{30.000000, 22.000000} size vec2{89.000000, 134.000000})
[ui::Manager] Window: ##MainMenuBar (pos vec2{0.000000, 0.000000} size vec2{1600.000000, 22.000000})
[ui::ProjectSerializer] Serializing 12 windows