mod: change interface for rendering of Layouts and Widgets to use a non-const pointer to the renderer instead

src/layout/Framing.zig

@@ -118,7 +118,7 @@ pub fn Layout(comptime Event: type, comptime Renderer: type) type {
         const round_frame = .{ "╭", "─", "╮", "│", "╰", "╯" };
         const square_frame = .{ "┌", "─", "┐", "│", "└", "┘" };
 
-        fn renderFrame(this: *@This(), renderer: Renderer) !void {
+        fn renderFrame(this: *@This(), renderer: *Renderer) !void {
             // FIXME: use renderer instead!
             _ = renderer;
             const frame = switch (this.config.frame) {
@@ -167,7 +167,7 @@ pub fn Layout(comptime Event: type, comptime Renderer: type) type {
             try this.config.style.value(writer, frame[5]);
         }
 
-        pub fn render(this: *@This(), renderer: Renderer) !void {
+        pub fn render(this: *@This(), renderer: *Renderer) !void {
             try renderer.clear(this.size);
             try this.renderFrame(renderer);
 

src/layout/HStack.zig

@@ -138,7 +138,7 @@ pub fn Layout(comptime Event: type, comptime Renderer: type) type {
             return &this.events;
         }
 
-        pub fn render(this: *@This(), renderer: Renderer) !void {
+        pub fn render(this: *@This(), renderer: *Renderer) !void {
             for (this.elements.items) |*element| {
                 switch (element.*) {
                     .layout => |*layout| {

src/layout/Padding.zig

@@ -123,7 +123,7 @@ pub fn Layout(comptime Event: type, comptime Renderer: type) type {
             return &this.events;
         }
 
-        pub fn render(this: *@This(), renderer: Renderer) !void {
+        pub fn render(this: *@This(), renderer: *Renderer) !void {
             switch ((&this.element).*) {
                 .layout => |*layout| {
                     try layout.render(renderer);

src/layout/VStack.zig

@@ -137,7 +137,7 @@ pub fn Layout(comptime Event: type, comptime Renderer: type) type {
             return &this.events;
         }
 
-        pub fn render(this: *@This(), renderer: Renderer) !void {
+        pub fn render(this: *@This(), renderer: *Renderer) !void {
             for (this.elements.items) |*element| {
                 switch (element.*) {
                     .layout => |*layout| {