BasicMarquee: change "text" parameter to std::string_view

src/BasicMarquee.cxx

@@ -20,10 +20,8 @@ BasicMarquee::ScrollString() const noexcept
 }
 
 bool
-BasicMarquee::Set(unsigned _width, const char *_text) noexcept
+BasicMarquee::Set(unsigned _width, std::string_view _text) noexcept
 {
-	assert(_text != nullptr);
-
 	if (_width == width && text == _text)
 		/* no change, do nothing (and, most importantly, do
 		   not reset the current offset!) */

src/BasicMarquee.hxx

@@ -54,7 +54,7 @@ public:
 	 * @param text the text in the locale charset
 	 * @return false if nothing was changed
 	 */
-	bool Set(unsigned width, const char *text) noexcept;
+	bool Set(unsigned width, std::string_view _text) noexcept;
 
 	/**
 	 * Removes the text.  It may be reused with Set().

src/StatusBar.cxx

@@ -182,7 +182,7 @@ StatusBar::Update(const struct mpd_status *status,
 				StringWidthMB(center_text.c_str());
 			if (width > 3 && center_width > (unsigned)width) {
 				hscroll.Set({(int)left_width, 0}, width,
-					    center_text.c_str(),
+					    center_text,
 					    Style::STATUS);
 			} else {
 				hscroll.Clear();

src/hscroll.cxx

@@ -16,11 +16,9 @@ hscroll::OnTimer() noexcept
 }
 
 void
-hscroll::Set(Point _position, unsigned _width, const char *_text,
+hscroll::Set(Point _position, unsigned _width, std::string_view _text,
 	     Style _style, attr_t _attr) noexcept
 {
-	assert(_text != nullptr);
-
 	position = _position;
 	style = _style;
 	attr = _attr;

src/hscroll.hxx

@@ -55,7 +55,7 @@ public:
 	 * every second with the current window attributes.  Call
 	 * hscroll_clear() to disable it.
 	 */
-	void Set(Point _position, unsigned width, const char *text,
+	void Set(Point _position, unsigned width, std::string_view text,
 		 Style style, attr_t attr=0) noexcept;
 
 	/**