LibGUI: Recalculate GlyphMapWidget content size when changing font

Previously, if it was displaying N glyphs per line, then you changed
font to one that was a drastically different size, it would continue to
display N glyphs per line until you resized the window. Now, we
immediately recalculate how many to show, so that they fill the
available width. :^)

Userland/Libraries/LibGUI/GlyphMapWidget.cpp

@@ -60,18 +60,7 @@ GlyphMapWidget::~GlyphMapWidget()
 
 void GlyphMapWidget::resize_event(ResizeEvent& event)
 {
-    int event_width = event.size().width() - vertical_scrollbar().width() - (frame_thickness() * 2) - m_horizontal_spacing;
-    int event_height = event.size().height() - (frame_thickness() * 2);
-    m_visible_glyphs = (event_width * event_height) / (font().max_glyph_width() * font().glyph_height());
-    m_columns = max(event_width / (font().max_glyph_width() + m_horizontal_spacing), 1);
-    m_rows = ceil_div(m_glyph_count, m_columns);
-
-    int content_width = columns() * (font().max_glyph_width() + m_horizontal_spacing);
-    int content_height = rows() * (font().glyph_height() + m_vertical_spacing) + frame_thickness();
-    set_content_size({ content_width, content_height });
-
-    scroll_to_glyph(m_active_glyph);
-
+    recalculate_content_size();
     AbstractScrollableWidget::resize_event(event);
 }
 
@@ -245,6 +234,7 @@ void GlyphMapWidget::keydown_event(KeyEvent& event)
 
 void GlyphMapWidget::did_change_font()
 {
+    recalculate_content_size();
     vertical_scrollbar().set_step(font().glyph_height() + m_vertical_spacing);
     set_active_glyph('A');
 }
@@ -262,4 +252,20 @@ void GlyphMapWidget::scroll_to_glyph(int glyph)
     scroll_into_view(scroll_rect, true, true);
 }
 
+void GlyphMapWidget::recalculate_content_size()
+{
+    auto inner_rect = frame_inner_rect();
+    int event_width = inner_rect.width() - vertical_scrollbar().width() - m_horizontal_spacing;
+    int event_height = inner_rect.height();
+    m_visible_glyphs = (event_width * event_height) / (font().max_glyph_width() * font().glyph_height());
+    m_columns = max(event_width / (font().max_glyph_width() + m_horizontal_spacing), 1);
+    m_rows = ceil_div(m_glyph_count, m_columns);
+
+    int content_width = columns() * (font().max_glyph_width() + m_horizontal_spacing);
+    int content_height = rows() * (font().glyph_height() + m_vertical_spacing) + frame_thickness();
+    set_content_size({ content_width, content_height });
+
+    scroll_to_glyph(m_active_glyph);
+}
+
 }

Userland/Libraries/LibGUI/GlyphMapWidget.h

@@ -75,6 +75,7 @@ private:
     void copy_glyph(int glyph);
     void paste_glyph(int glyph);
     void delete_glyph(int glyph);
+    void recalculate_content_size();
 
     int m_glyph_count { 0x110000 };
     int m_columns { 0 };