Option (def true) to inherit font size on new window

src/App.zig

@@ -11,6 +11,7 @@ const tracy = @import("tracy");
 const Config = @import("config.zig").Config;
 const BlockingQueue = @import("./blocking_queue.zig").BlockingQueue;
 const renderer = @import("renderer.zig");
+const font = @import("font/main.zig");
 
 const log = std.log.scoped(.app);
 
@@ -55,7 +56,7 @@ pub fn create(alloc: Allocator, config: *const Config) !*App {
     errdefer app.windows.deinit(alloc);
 
     // Create the first window
-    try app.newWindow();
+    try app.newWindow(.{});
 
     return app;
 }
@@ -108,7 +109,7 @@ fn drainMailbox(self: *App) !void {
     while (drain.next()) |message| {
         log.debug("mailbox message={s}", .{@tagName(message)});
         switch (message) {
-            .new_window => try self.newWindow(),
+            .new_window => |msg| try self.newWindow(msg),
             .quit => try self.setQuit(),
             .window_message => |msg| try self.windowMessage(msg.window, msg.message),
         }
@@ -116,11 +117,14 @@ fn drainMailbox(self: *App) !void {
 }
 
 /// Create a new window
-fn newWindow(self: *App) !void {
+fn newWindow(self: *App, msg: Message.NewWindow) !void {
     var window = try Window.create(self.alloc, self, self.config);
     errdefer window.destroy();
     try self.windows.append(self.alloc, window);
     errdefer _ = self.windows.pop();
+
+    // Set initial font size if given
+    if (msg.font_size) |size| window.setFontSize(size);
 }
 
 /// Start quitting
@@ -153,7 +157,7 @@ fn windowMessage(self: *App, win: *Window, msg: Window.Message) !void {
 /// The message types that can be sent to the app thread.
 pub const Message = union(enum) {
     /// Create a new terminal window.
-    new_window: void,
+    new_window: NewWindow,
 
     /// Quit
     quit: void,
@@ -163,4 +167,10 @@ pub const Message = union(enum) {
         window: *Window,
         message: Window.Message,
     },
+
+    const NewWindow = struct {
+        /// The font size to create the window with or null to default to
+        /// the configuration amount.
+        font_size: ?font.face.DesiredSize = null,
+    };
 };

src/Window.zig

@@ -558,7 +558,9 @@ fn setCellSize(self: *Window, size: renderer.CellSize) !void {
 }
 
 /// Change the font size.
-fn setFontSize(self: *Window, size: font.face.DesiredSize) void {
+///
+/// This can only be called from the main thread.
+pub fn setFontSize(self: *Window, size: font.face.DesiredSize) void {
     // Update our font size so future changes work
     self.font_size = size;
 
@@ -917,7 +919,12 @@ fn keyCallback(
 
                 .new_window => {
                     _ = win.app.mailbox.push(.{
-                        .new_window = {},
+                        .new_window = .{
+                            .font_size = if (win.config.@"window-inherit-font-size")
+                                win.font_size
+                            else
+                                null,
+                        },
                     }, .{ .instant = {} });
                     win.app.wakeup();
                 },

src/config.zig

@@ -115,6 +115,12 @@ pub const Config = struct {
     /// to balance the padding given a certain viewport size and grid cell size.
     @"window-padding-balance": bool = true,
 
+    /// If true, new windows will inherit the font size of the previously
+    /// focused window. If no window was previously focused, the default
+    /// font size will be used. If this is false, the default font size
+    /// specified in the configuration "font-size" will be used.
+    @"window-inherit-font-size": bool = true,
+
     /// Additional configuration files to read.
     @"config-file": RepeatableString = .{},