highlight tabs only on unviewed messages (#5649)

src/widgets/helper/NotebookTab.hpp

@@ -2,6 +2,7 @@
 
 #include "common/Common.hpp"
 #include "widgets/helper/Button.hpp"
+#include "widgets/helper/ChannelView.hpp"
 #include "widgets/Notebook.hpp"
 
 #include <pajlada/settings/setting.hpp>
@@ -59,11 +60,24 @@ public:
      **/
     bool isLive() const;
 
+    /**
+     * @brief Sets the highlight state of this tab clearing highlight sources
+     *
+     * Obeys the HighlightsEnabled setting and highlight states hierarchy
+     */
     void setHighlightState(HighlightState style);
-    HighlightState highlightState() const;
-
+    /**
+     * @brief Updates the highlight state and highlight sources of this tab
+     *
+     * Obeys the HighlightsEnabled setting and the highlight state hierarchy and tracks the highlight state update sources
+     */
+    void updateHighlightState(HighlightState style,
+                              const ChannelView &channelViewSource);
+    void copyHighlightStateAndSourcesFrom(const NotebookTab *sourceTab);
     void setHighlightsEnabled(const bool &newVal);
+    void newHighlightSourceAdded(const ChannelView &channelViewSource);
     bool hasHighlightsEnabled() const;
+    HighlightState highlightState() const;
 
     void moveAnimated(QPoint targetPos, bool animated = true);
 
@@ -107,6 +121,16 @@ private:
 
     int normalTabWidthForHeight(int height) const;
 
+    bool shouldMessageHighlight(const ChannelView &channelViewSource) const;
+
+    using HighlightSources =
+        std::unordered_map<ChannelView::ChannelViewID, HighlightState>;
+    HighlightSources highlightSources_;
+
+    void removeHighlightStateChangeSources(const HighlightSources &toRemove);
+    void removeHighlightSource(const ChannelView::ChannelViewID &source);
+    void updateHighlightStateDueSourcesChange();
+
     QPropertyAnimation positionChangedAnimation_;
     QPoint positionAnimationDesiredPoint_;