Hyprland: Fullscreen Workspace Swipes

The Bug

When using the scrolling layout in Hyprland and using touchpad gestures to switch workspaces, the top layer (like Waybar) wouldn't disappear when moving into a fullscreen application. This broke the immersion of fullscreen apps and left the bar floating over content.

The Fix

The issue stemmed from the fullscreen checks relying on m_fullscreenMode and m_hasFullscreenWindow boolean state flags that were cached at the workspace level. During a swipe gesture, these flags could become desynced depending on the animation state.

I updated the codebase to determine the fullscreen state dynamically through getFullscreenWindow() rather than relying on the cached booleans. I also added an isDirection(char) overload and handled empty string views (sv.empty()) to make the layout engine more robust.

Impact

The pull request was merged into Hyprland's main branch, fixing #15053 and closing #14721. It was a great opportunity to dive into a modern C++ codebase and understand the intricacies of Wayland compositing and animation layers.