Don't limit width of messages with code blocks

TODO.md

@@ -2,7 +2,7 @@
 
 - add room members loading indicator
 
-- fix event ID mention regex
+- fix main pane appearance when collapsed
 - fix lag when clicking accounts in the AccountBar with a very long room list
 - fix: on startup, if a room's last event is a membership change,
   it won't be visible in timeline no matter what the user config is

src/gui/Pages/Chat/Timeline/EventContent.qml

@@ -63,6 +63,8 @@ HRowLayout {
         0
 
     readonly property int maxMessageWidth:
+        contentText.includes("<pre>") ?
+        -1 :
         window.settings.maxMessageCharactersPerLine < 0 ?
         -1 :
         Math.ceil(