UI: tweak drawing of header status text for transparent headers.

source/blender/blenlib/intern/string.c

@@ -778,6 +778,21 @@ void BLI_str_toupper_ascii(char *str, const size_t len)
 			str[i] -= 'a' - 'A';
 }
 
+/**
+ * Strip whitespace from end of the string.
+ */
+void BLI_str_rstrip(char *str)
+{
+	for (int i = strlen(str) - 1; i > 0; i--) {
+		if (isspace(str[i])) {
+			str[i] = '\0';
+		}
+		else {
+			break;
+		}
+	}
+}
+
 /**
  * Strip trailing zeros from a float, eg:
  *   0.0000 -> 0.0