(svn r25340) [1.3] -Backport from trunk:

- Fix: Loading only 8 bits into a 16 bit variable could cause endianness problems (r25337)
- Fix: Check for zero width space in translations and fail upon finding them [FS#5589] (r25326)
- Fix: [SDL] Keyboard input stopped working after fullscreen toggle [FS#5580] (r25318)
- Fix: Proper size-estimation for numbers with n digits, i.e. not assume a particular number is the widest [FS#5562] (r25314, r25313)

src/gfx.cpp

@@ -1621,6 +1621,24 @@ byte GetDigitWidth(FontSize size)
 	return width;
 }
 
+/**
+ * Determine the broadest digits for guessing the maximum width of a n-digit number.
+ * @param [out] front Broadest digit, which is not 0. (Use this digit as first digit for numbers with more than one digit.)
+ * @param [out] next Broadest digit, including 0. (Use this digit for all digits, except the first one; or for numbers with only one digit.)
+ * @param size  Font of the digit
+ */
+void GetBroadestDigit(uint *front, uint *next, FontSize size)
+{
+	int width = -1;
+	for (char c = '9'; c >= '0'; c--) {
+		int w = GetCharacterWidth(size, c);
+		if (w > width) {
+			width = w;
+			*next = c - '0';
+			if (c != '0') *front = c - '0';
+		}
+	}
+}
 
 void ScreenSizeChanged()
 {