Reduce allocations required for the palette

src/ui/Theme.cpp

@@ -12,6 +12,7 @@ Theme::paletteFromTheme(std::string_view theme)
     [[maybe_unused]] static auto meta = qRegisterMetaType<Theme>("Theme");
     static QPalette original;
     if (theme == "light") {
+        static QPalette lightActive = [] {
             QPalette lightActive(
               /*windowText*/ QColor(0x33, 0x33, 0x33),
               /*button*/ QColor(Qt::GlobalColor::white),
@@ -30,7 +31,10 @@ Theme::paletteFromTheme(std::string_view theme)
             lightActive.setColor(QPalette::Link, QColor(0x00, 0x77, 0xb5));
             lightActive.setColor(QPalette::ButtonText, QColor(0x55, 0x54, 0x59));
             return lightActive;
+        }();
+        return lightActive;
     } else if (theme == "dark") {
+        static QPalette darkActive = [] {
             QPalette darkActive(
               /*windowText*/ QColor(0xca, 0xcc, 0xd1),
               /*button*/ QColor(Qt::GlobalColor::white),
@@ -49,6 +53,8 @@ Theme::paletteFromTheme(std::string_view theme)
             darkActive.setColor(QPalette::Link, QColor(0x38, 0xa3, 0xd8));
             darkActive.setColor(QPalette::ButtonText, QColor(0x82, 0x82, 0x84));
             return darkActive;
+        }();
+        return darkActive;
     } else {
         return original;
     }