mod(size): rename merge function to add; new max function

src/container.zig

@@ -595,7 +595,7 @@ pub fn Container(comptime Event: type) type {
             const len: u16 = @truncate(this.elements.items.len);
             if (len > 0) {
                 for (this.elements.items) |element| {
-                    size = size.merge(element.minSize());
+                    size = size.add(element.minSize());
                 }
                 var gap = this.properties.layout.gap;
                 if (this.properties.layout.separator.enabled) gap += 1;
@@ -605,10 +605,7 @@ pub fn Container(comptime Event: type) type {
                     .vertical => size.rows += gap * (len - 1),
                 }
             }
-            return .{
-                .cols = @max(size.cols, this.properties.min_size.cols),
-                .rows = @max(size.rows, this.properties.min_size.rows),
-            };
+            return size.max(this.properties.min_size);
         }
 
         pub fn handle(this: *@This(), event: Event) !void {

src/element.zig

@@ -86,12 +86,8 @@ pub fn Scrollable(Event: type) type {
                 .resize => |size| {
                     this.size = size;
                     // TODO: scrollbar space - depending on configuration and only if necessary?
-                    const min_size = this.container.minSize();
-                    this.container_size = .{
-                        .anchor = size.anchor,
-                        .cols = @max(min_size.cols, size.cols),
-                        .rows = @max(min_size.rows, size.rows),
-                    };
+                    this.container_size = size.max(this.container.minSize());
+                    this.container_size.anchor = size.anchor;
                     try this.container.handle(.{ .resize = this.container_size });
                 },
                 // TODO: other means to scroll except with the mouse? (i.e. Ctrl-u/d, k/j, etc.?)

src/size.zig

@@ -3,12 +3,61 @@ pub const Size = packed struct {
     cols: u16 = 0,
     rows: u16 = 0,
 
-    pub fn merge(this: @This(), other: @This()) Size {
+    pub fn add(this: @This(), other: @This()) Size {
         return .{
             .cols = this.cols + other.cols,
             .rows = this.rows + other.rows,
         };
     }
+
+    pub fn max(this: @This(), other: @This()) Size {
+        return .{
+            .cols = @max(this.cols, other.cols),
+            .rows = @max(this.rows, other.rows),
+        };
+    }
+
+    test "adding" {
+        const testing = @import("std").testing;
+
+        const a: @This() = .{
+            .anchor = .{ .col = 1, .row = 2 },
+            .cols = 10,
+            .rows = 20,
+        };
+
+        const b: @This() = .{
+            .anchor = .{ .col = 5, .row = 20 },
+            .cols = 20,
+            .rows = 10,
+        };
+
+        try testing.expectEqual(@This(){
+            .cols = 30,
+            .rows = 30,
+        }, a.add(b));
+    }
+
+    test "maximum" {
+        const testing = @import("std").testing;
+
+        const a: @This() = .{
+            .anchor = .{ .col = 1, .row = 2 },
+            .cols = 10,
+            .rows = 20,
+        };
+
+        const b: @This() = .{
+            .anchor = .{ .col = 5, .row = 20 },
+            .cols = 20,
+            .rows = 10,
+        };
+
+        try testing.expectEqual(@This(){
+            .cols = 20,
+            .rows = 20,
+        }, a.max(b));
+    }
 };
 
 pub const Position = packed struct {