fix: fullscreen on new windows

src/Surface.zig

@@ -155,6 +155,7 @@ const DerivedConfig = struct {
     window_padding_y: u32,
     window_padding_balance: bool,
     title: ?[:0]const u8,
+    fullscreen: bool,
 
     pub fn init(alloc_gpa: Allocator, config: *const configpkg.Config) !DerivedConfig {
         var arena = ArenaAllocator.init(alloc_gpa);
@@ -180,6 +181,7 @@ const DerivedConfig = struct {
             .window_padding_y = config.@"window-padding-y",
             .window_padding_balance = config.@"window-padding-balance",
             .title = config.title,
+            .fullscreen = config.fullscreen,
 
             // Assignments happen sequentially so we have to do this last
             // so that the memory is captured from allocs above.

src/apprt/gtk/App.zig

@@ -325,6 +325,15 @@ pub fn redrawInspector(self: *App, surface: *Surface) void {
 pub fn newWindow(self: *App, parent_: ?*CoreSurface) !void {
     const alloc = self.core_app.alloc;
 
+    // If we are in fullscreen mode and have a parent surface we force the disable of this setting.
+    // This prevents that new windows get created in fullscreen mode.
+    // This also prevents that the settings always gets set to false everytime a new window is created.
+    if (self.config.fullscreen) {
+        if (parent_) |_| {
+            self.config.fullscreen = false;
+        }
+    }
+
     // Allocate a fixed pointer for our window. We try to minimize
     // allocations but windows and other GUI requirements are so minimal
     // compared to the steady-state terminal operation so we use heap