Use uint32_t for codepoint type in text events.

include/widget/Widget.hpp

@@ -299,7 +299,7 @@ struct Widget : WeakBase {
 	/** An event prototype with a Unicode character. */
 	struct TextBaseEvent {
 		/** Unicode code point of the character */
-		int codepoint;
+		uint32_t codepoint;
 	};
 	/** Occurs when a character is typed while the mouse is hovering a Widget.
 	Recurses.

include/widget/event.hpp

@@ -148,7 +148,7 @@ struct EventState {
 	bool handleHover(math::Vec pos, math::Vec mouseDelta);
 	bool handleLeave();
 	bool handleScroll(math::Vec pos, math::Vec scrollDelta);
-	bool handleText(math::Vec pos, int codepoint);
+	bool handleText(math::Vec pos, uint32_t codepoint);
 	bool handleKey(math::Vec pos, int key, int scancode, int action, int mods);
 	bool handleDrop(math::Vec pos, const std::vector<std::string>& paths);
 	bool handleDirty();

src/widget/event.cpp

@@ -268,7 +268,7 @@ bool EventState::handleDrop(math::Vec pos, const std::vector<std::string>& paths
 	return !!cPathDrop.target;
 }
 
-bool EventState::handleText(math::Vec pos, int codepoint) {
+bool EventState::handleText(math::Vec pos, uint32_t codepoint) {
 	if (selectedWidget) {
 		// Dispatch SelectTextEvent
 		EventContext cSelectText;