Codechange: Add constant for common blink interval.

src/smallmap_gui.cpp

@@ -730,7 +730,7 @@ protected:
 	}
 
 	/** Blink the industries (if selected) on a regular interval. */
-	const IntervalTimer<TimerWindow> blink_interval = {std::chrono::milliseconds(450), [this](auto) {
+	const IntervalTimer<TimerWindow> blink_interval = {TIMER_BLINK_INTERVAL, [this](auto) {
 		Blink();
 	}};
 

src/timer/timer_window.h

@@ -32,4 +32,7 @@ public:
 	};
 };
 
+/** Interval used by blinking interface elements. */
+static constexpr std::chrono::milliseconds TIMER_BLINK_INTERVAL{450};
+
 #endif /* TIMER_WINDOW_H */

src/window.cpp

@@ -3073,7 +3073,7 @@ static const IntervalTimer<TimerWindow> window_interval(std::chrono::millisecond
 });
 
 /** Blink the window highlight colour constantly. */
-static const IntervalTimer<TimerWindow> highlight_interval(std::chrono::milliseconds(450), [](auto) {
+static const IntervalTimer<TimerWindow> highlight_interval(TIMER_BLINK_INTERVAL, [](auto) {
 	_window_highlight_colour = !_window_highlight_colour;
 });