chore: removed setInitialWindowPosition from gtk and renamed window-position-{x,y} to start-position-{x,y} for clarity

src/Surface.zig

@@ -621,8 +621,8 @@ pub fn init(
         const width = @max(config.@"window-width" * cell_size.width, 640);
         const width_f32: f32 = @floatFromInt(width);
         const height_f32: f32 = @floatFromInt(height);
-        const position_x = config.@"window-position-x";
-        const position_y = config.@"window-position-y";
+        const position_x = config.@"start-position-x";
+        const position_y = config.@"start-position-y";
 
         // The final values are affected by content scale and we need to
         // account for the padding so we get the exact correct grid size.

src/apprt/gtk/App.zig

@@ -474,7 +474,6 @@ pub fn performAction(
         .pwd => try self.setPwd(target, value),
         .present_terminal => self.presentTerminal(target),
         .initial_size => try self.setInitialSize(target, value),
-        .initial_position => self.setInitialPosition(target, value),
         .mouse_visibility => self.setMouseVisibility(target, value),
         .mouse_shape => try self.setMouseShape(target, value),
         .mouse_over_link => self.setMouseOverLink(target, value),
@@ -788,20 +787,6 @@ fn setInitialSize(
     }
 }
 
-fn setInitialPosition(
-    _: *App,
-    target: apprt.Target,
-    value: apprt.action.InitialPosition,
-) void {
-    switch (target) {
-        .app => {},
-        .surface => |v| try v.rt_surface.setInitialWindowPosition(
-            value.x,
-            value.y,
-        ),
-    }
-}
-
 fn showDesktopNotification(
     self: *App,
     target: apprt.Target,

src/apprt/gtk/Surface.zig

@@ -840,12 +840,6 @@ pub fn setInitialWindowSize(self: *const Surface, width: u32, height: u32) !void
     );
 }
 
-pub fn setInitialWindowPosition(self: *const Surface, x: i32, y: i32) !void {
-    // We need the surface's window to set the position.
-    const window = self.container.window() orelse return;
-    c.gtk_window_move(@ptrCast(window.window), x, y);
-}
-
 pub fn grabFocus(self: *Surface) void {
     if (self.container.tab()) |tab| {
         // If any other surface was focused and zoomed in, set it to non zoomed in

src/config/Config.zig

@@ -1117,9 +1117,12 @@ keybind: Keybinds = .{},
 /// to be a certain position to fit within the grid. There is nothing Ghostty
 /// will do about this, but it will make an effort.
 ///
+/// Important note: Setting this value will only work on macOs and glfw builds
+/// on Linux. GTK 4.0 does not support setting the window position.
+///
 /// This will default to the top-left corner of the screen if not set (0, 0).
-@"window-position-x": i32 = 0,
-@"window-position-y": i32 = 0,
+@"start-position-x": i32 = 0,
+@"start-position-y": i32 = 0,
 
 /// Whether to enable saving and restoring window state. Window state includes
 /// their position, size, tabs, splits, etc. Some window state requires shell