feat: add Go to message action in various places (#3953)

* feat: add `Go to message` action in search popup

* chore: add changelog entry

* fix: only scroll if the scrollbar is shown

* fix: go to message when view isn't focused

* feat: animate highlighted message

* fix: missing includes

* fix: order of initialization

* fix: add `ChannelView::mayContainMessage` to filter messages

* feat: add `Go to message` action in `/mentions`

* fix: ignore any mentions channel when searching for split

* feat: add `Go to message` action in reply-threads

* fix: remove redundant `source` parameter

* feat: add `Go to message` action in user-cards

* feat: add link to deleted message

* fix: set current time to 0 when starting animation

* chore: update changelog

* fix: add default case (unreachable)

* chore: removed unused variable

* fix: search in mentions

* fix: always attempt to focus split

* fix: rename `Link::MessageId` to `Link::JumpToMessage`

* fix: rename `selectAndScrollToMessage` to `scrollToMessage`

* fix: rename internal `scrollToMessage` to `scrollToMessageLayout`

* fix: deleted message link in search popup

* chore: reword explanation

* fix: use for-loop instead of `std::find_if`

* refactor: define highlight colors in `BaseTheme`

* core: replace `iff` with `if`

* fix: only return if the message found

* Reword/phrase/dot changelog entries

Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/singletons/WindowManager.hpp

@@ -15,6 +15,7 @@ class Settings;
 class Paths;
 class Window;
 class SplitContainer;
+class ChannelView;
 
 enum class MessageElementFlag : int64_t;
 using MessageElementFlags = FlagsEnum<MessageElementFlag>;
@@ -66,6 +67,13 @@ public:
 
     void select(Split *split);
     void select(SplitContainer *container);
+    /**
+     * Scrolls to the message in a split that's not
+     * a mentions view and focuses the split.
+     *
+     * @param message Message to scroll to.
+     */
+    void scrollToMessage(const MessagePtr &message);
 
     QPoint emotePopupPos();
     void setEmotePopupPos(QPoint pos);
@@ -105,6 +113,7 @@ public:
 
     pajlada::Signals::Signal<Split *> selectSplit;
     pajlada::Signals::Signal<SplitContainer *> selectSplitContainer;
+    pajlada::Signals::Signal<const MessagePtr &> scrollToMessageSignal;
 
 private:
     static void encodeNodeRecursively(SplitContainer::Node *node,