Replace links with HTML <a> tags when messages have a formatted_body and in all other cases

This makes (https) links show up as actual links when they're in a message with a `formatted_body`. For example, the pursuivant messages in any KDE channel (like #kirigami), or links which are in a reply to another message/image.

Also corrected a regex mistake in another place using the same link replacement regex.

Fix #331

imports/NeoChat/Component/Timeline/RichLabel.qml

@@ -15,7 +15,24 @@ TextEdit {
     readonly property var hasSpoiler: /data-mx-spoiler/g
 
     property bool isEmote: false
-    property string textMessage: model.display
+
+    /* Turn all links which aren't already in <a> tags into <a> hyperlinks */
+    readonly property var linkRegex: /(href=["'])?(\b(https?):\/\/[^\s\<\>\"\'\\]+)/g
+    property string textMessage: model.display.includes("http")
+        ? model.display.replace(linkRegex, function() {
+            if (arguments[1]) {
+                return arguments[0];
+            } else {
+                var l = arguments[2];
+                if ([".", ","].includes(l[l.length-1])) {
+                    var link = l.substring(0, l.length-1);
+                    var leftover = l[l.length-1];
+                    return "<a href=\"" + link + "\">" + link + "</a>" + leftover;
+                }
+                return "<a href=\"" + l + "\">" + l + "</a>";
+          }
+        })
+        : model.display
     property bool spoilerRevealed: !hasSpoiler.test(textMessage)
 
     ListView.onReused: Qt.binding(() => !hasSpoiler.test(textMessage))

imports/NeoChat/Panel/RoomDrawer.qml

@@ -194,7 +194,7 @@ Kirigami.OverlayDrawer {
                 TextEdit {
                     Layout.fillWidth: true
                     text: room && room.topic ? room.topic.replace(replaceLinks, "<a href=\"$1\">$1</a>") : i18n("No Topic")
-                    readonly property var replaceLinks: /\(https:\/\/[^ ]*\)/
+                    readonly property var replaceLinks: /(https:\/\/[^ ]*)/
                     textFormat: TextEdit.MarkdownText
                     wrapMode: Text.WordWrap
                     selectByMouse: true