Do not show any book text after last <BR> tag.

CHANGELOG.md

@@ -8,6 +8,7 @@
     Bug #3997: Almalexia doesn't pace
     Bug #4036: Weird behaviour of AI packages if package target has non-unique ID
     Bug #4047: OpenMW not reporting its version number in MacOS; OpenMW-CS not doing it fully
+    Bug #4215: OpenMW shows book text after last <BR> tag
     Bug #4221: Characters get stuck in V-shaped terrain
     Bug #4251: Stationary NPCs do not return to their position after combat
     Bug #4293: Faction members are not aware of faction ownerships in barter

apps/openmw/mwgui/formatting.cpp

@@ -31,6 +31,14 @@ namespace MWGui
 
             boost::algorithm::replace_all(mText, "\r", "");
 
+            // vanilla game does not show any text after last <BR> tag.
+            const std::string lowerText = Misc::StringUtils::lowerCase(mText);
+            int index = lowerText.rfind("<br>");
+            if (index == -1)
+                mText = "";
+            else
+                mText = mText.substr(0, index+4);
+
             registerTag("br", Event_BrTag);
             registerTag("p", Event_PTag);
             registerTag("img", Event_ImgTag);