LibGUI: Implement calculated_min_size() for DialogButton

Dialog buttons now scale based on presentation size to accomodate
larger fonts while retaining uniform widths. Scaling by 8 is
arbitrary but preserves the historical 80 pixel width with Katica 10.
This needs improvement but works well for most fonts as a start.

2 files changed, 14 insertions, 1 deletions

diff --git a/Userland/Libraries/LibGUI/Button.cpp b/Userland/Libraries/LibGUI/Button.cpp
index 10874bd0e4..90168754da 100644
--- a/Userland/Libraries/LibGUI/Button.cpp
+++ b/Userland/Libraries/LibGUI/Button.cpp
@@ -291,4 +291,14 @@ Optional<UISize> Button::calculated_min_size() const
     return UISize(width, height);
 }
 
+Optional<UISize> DialogButton::calculated_min_size() const
+{
+    int constexpr scale = 8;
+    int constexpr padding = 6;
+    int width = max(80, font().presentation_size() * scale);
+    int height = max(22, font().pixel_size_rounded_up() + padding);
+
+    return UISize(width, height);
+}
+
 }
diff --git a/Userland/Libraries/LibGUI/Button.h b/Userland/Libraries/LibGUI/Button.h
index 6936517963..8dd50fa675 100644
--- a/Userland/Libraries/LibGUI/Button.h
+++ b/Userland/Libraries/LibGUI/Button.h
@@ -95,8 +95,11 @@ public:
     explicit DialogButton(String text = {})
         : Button(move(text))
     {
-        set_fixed_width(80);
+        set_min_size({ SpecialDimension::Shrink });
+        set_preferred_size({ SpecialDimension::Shrink });
     }
+
+    virtual Optional<UISize> calculated_min_size() const override;
 };
 
 }