Improvements for linking to events

- Fixes scrolling to an event not being reliable
- Adds new /goto command that can open URLs, go to events, or go to message indexes.
- Refactored ChatPage::handleMatrixUri() to contain the handling originally in Nheko::openLink(), and makes it return a boolean based on whether the URL was handled internally or not.

src/timeline/InputBar.cpp

@@ -630,6 +630,23 @@ InputBar::command(QString command, QString args)
                 notice(args, false);
         } else if (command == "rainbownotice") {
                 notice(args, true);
+        } else if (command == "goto") {
+                // Goto has three different modes:
+                // 1 - Going directly to a given event ID
+                if (args[0] == '$') {
+                        room->showEvent(args);
+                        return;
+                }
+                // 2 - Going directly to a given message index
+                if (args[0] >= '0' && args[0] <= '9') {
+                        room->showEvent(args);
+                        return;
+                }
+                // 3 - Matrix URI handler, as if you clicked the URI
+                if (ChatPage::instance()->handleMatrixUri(args)) {
+                        return;
+                }
+                nhlog::net()->error("Could not resolve goto: {}", args.toStdString());
         }
 }