Merge: searching from the message pane (item 85)

Five surfaces in the message pane offer a search built from what they show:
the header's subject and date, its sender and recipients on a single-message
thread, a tag chip, a body selection, and every header per message in the
details dialog. Each offers Search for this, which replaces the query, and
Add to search, which narrows it.

The details dialog became labelled rows along the way, which the user wanted
independently of this feature.

Hand tested through every surface, including the case the parenthesising
exists for: adding a sender to 'tag:inbox or tag:flagged' narrows it rather
than widening it.

1 files changed, 23 insertions, 0 deletions

diff --git a/src/tagstrip.h b/src/tagstrip.h
index 4102bed..f59233b 100644
--- a/src/tagstrip.h
+++ b/src/tagstrip.h
@@ -18,10 +18,12 @@
 
 #pragma once
 
+#include <QRect>
 #include <QStringList>
 #include <QWidget>
 
 class TagColors;
+class QContextMenuEvent;
 
 /// One row of tag chips under the message pane.
 ///
@@ -48,9 +50,30 @@ public:
     QStringList visibleTags() const { return m_visible; }
     QStringList hiddenTags() const { return m_hidden; }
 
+    /// The rect of the visible chip at `index`, empty when out of range.
+    ///
+    /// The SAME function paintEvent lays out from, so what is drawn and what
+    /// is clickable cannot drift. `CardDelegate::expanderRectFor` exists for
+    /// this reason and this follows it.
+    QRect chipRectAt(int index) const;
+
+    /// The tag under `point`, empty when the point is on no chip.
+    ///
+    /// The trailing "+N" chip yields an empty string: it stands for a list of
+    /// tags rather than for one, so there is nothing a search could name.
+    QString chipAt(const QPoint &point) const;
+
+signals:
+    /// A visible chip was right-clicked. `globalPos` is where to pop a menu.
+    ///
+    /// The strip does not build the menu itself: what a tag can do belongs to
+    /// the window, which owns the query bar and the actions.
+    void tagContextMenuRequested(const QString &tag, const QPoint &globalPos);
+
 protected:
     void paintEvent(QPaintEvent *event) override;
     void resizeEvent(QResizeEvent *event) override;
+    void contextMenuEvent(QContextMenuEvent *event) override;
 
 private:
     /// Recomputes the visible/hidden split for the current width.