binds: option to fullscreen pinned window

src/Compositor.cpp

@@ -2338,7 +2338,8 @@ void CCompositor::setWindowFullscreenClient(const PHLWINDOW PWINDOW, const eFull
 }
 
 void CCompositor::setWindowFullscreenState(const PHLWINDOW PWINDOW, sFullscreenState state) {
-    static auto PDIRECTSCANOUT = CConfigValue<Hyprlang::INT>("render:direct_scanout");
+    static auto PDIRECTSCANOUT      = CConfigValue<Hyprlang::INT>("render:direct_scanout");
+    static auto PALLOWPINFULLSCREEN = CConfigValue<Hyprlang::INT>("binds:allow_pin_fullscreen");
 
     if (!validMapped(PWINDOW) || g_pCompositor->m_bUnsafeState)
         return;
@@ -2352,7 +2353,17 @@ void CCompositor::setWindowFullscreenState(const PHLWINDOW PWINDOW, sFullscreenS
     const eFullscreenMode CURRENT_EFFECTIVE_MODE = (eFullscreenMode)std::bit_floor((uint8_t)PWINDOW->m_sFullscreenState.internal);
     const eFullscreenMode EFFECTIVE_MODE         = (eFullscreenMode)std::bit_floor((uint8_t)state.internal);
 
-    const bool            CHANGEINTERNAL = !(PWINDOW->m_bPinned || CURRENT_EFFECTIVE_MODE == EFFECTIVE_MODE || (PWORKSPACE->m_bHasFullscreenWindow && !PWINDOW->isFullscreen()));
+    if (*PALLOWPINFULLSCREEN && !PWINDOW->m_bPinFullscreened && !PWINDOW->isFullscreen() && PWINDOW->m_bPinned) {
+        PWINDOW->m_bPinned          = false;
+        PWINDOW->m_bPinFullscreened = true;
+    }
+
+    const bool CHANGEINTERNAL = !(PWINDOW->m_bPinned || CURRENT_EFFECTIVE_MODE == EFFECTIVE_MODE || (PWORKSPACE->m_bHasFullscreenWindow && !PWINDOW->isFullscreen()));
+
+    if (*PALLOWPINFULLSCREEN && PWINDOW->m_bPinFullscreened && PWINDOW->isFullscreen() && !PWINDOW->m_bPinned && state.internal == FSMODE_NONE) {
+        PWINDOW->m_bPinned          = true;
+        PWINDOW->m_bPinFullscreened = false;
+    }
 
     // TODO: update the state on syncFullscreen changes
     if (!CHANGEINTERNAL && PWINDOW->m_sWindowData.syncFullscreen.valueOrDefault())

src/config/ConfigDescriptions.hpp

@@ -1194,6 +1194,12 @@ inline static const std::vector<SConfigOptionDescription> CONFIG_OPTIONS = {
         .type        = CONFIG_OPTION_BOOL,
         .data        = SConfigOptionDescription::SBoolData{true},
     },
+    SConfigOptionDescription{
+        .value       = "binds:allow_pin_fullscreen",
+        .description = "Allows fullscreen to pinned windows, and restore their pinned status afterwards",
+        .type        = CONFIG_OPTION_BOOL,
+        .data        = SConfigOptionDescription::SBoolData{true},
+    },
 
     /*
      * xwayland:

src/config/ConfigManager.cpp

@@ -534,6 +534,7 @@ CConfigManager::CConfigManager() {
     m_pConfig->addConfigValue("binds:movefocus_cycles_fullscreen", Hyprlang::INT{1});
     m_pConfig->addConfigValue("binds:disable_keybind_grabbing", Hyprlang::INT{0});
     m_pConfig->addConfigValue("binds:window_direction_monitor_fallback", Hyprlang::INT{1});
+    m_pConfig->addConfigValue("binds:allow_pin_fullscreen", Hyprlang::INT{0});
 
     m_pConfig->addConfigValue("gestures:workspace_swipe", Hyprlang::INT{0});
     m_pConfig->addConfigValue("gestures:workspace_swipe_fingers", Hyprlang::INT{3});

src/desktop/Window.hpp

@@ -332,6 +332,9 @@ class CWindow {
     // For pinned (sticky) windows
     bool m_bPinned = false;
 
+    // For preserving pinned state when fullscreening a pinned window
+    bool m_bPinFullscreened = false;
+
     // urgency hint
     bool m_bIsUrgent = false;