Merge branch 'feature/qaction-menus'

Menus, a toolbar and a generated shortcut reference, built on converting
the action registry from a hash of callbacks to QActions. Along the way:
three default key bindings that had never fired, a shortcut dialog taller
than the screen, thread list columns that could not be resized, no visible
feedback that a tag action had landed, and a tags column so wide it was
unreadable.

Backlog items 3, 8, 9, 13 and 14 done; 11 partly.

1 files changed, 126 insertions, 0 deletions

diff --git a/src/tagchip.cpp b/src/tagchip.cpp
new file mode 100644
index 0000000..2e21419
--- /dev/null
+++ b/src/tagchip.cpp
@@ -0,0 +1,126 @@
+/*
+ * qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs
+ * Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "tagchip.h"
+
+#include <QApplication>
+#include <QFontMetrics>
+#include <QPainter>
+
+#include "tagcolors.h"
+#include "threadlistmodel.h"
+
+namespace TagChip {
+
+QSize sizeFor(const QFontMetrics &metrics, const QString &text)
+{
+    return QSize(metrics.horizontalAdvance(text) + kPaddingX * 2,
+                 metrics.height() + kPaddingY * 2);
+}
+
+void paint(QPainter *painter, const QRect &rect, const QString &text,
+           const QColor &background)
+{
+    painter->save();
+    painter->setRenderHint(QPainter::Antialiasing, true);
+    painter->setPen(Qt::NoPen);
+    painter->setBrush(background);
+    painter->drawRoundedRect(rect, kRadius, kRadius);
+
+    painter->setPen(TagColors::textColourOn(background));
+    painter->drawText(rect, Qt::AlignCenter, text);
+    painter->restore();
+}
+
+}  // namespace TagChip
+
+void SubjectDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
+                            const QModelIndex &index) const
+{
+    const QString account =
+        index.data(ThreadListModel::AccountLabelRole).toString();
+    if (account.isEmpty()) {
+        QStyledItemDelegate::paint(painter, option, index);
+        return;
+    }
+
+    // Draw the row's own background and selection first, then the chip and the
+    // subject on top, so a selected or struck-through row still looks right.
+    QStyleOptionViewItem chrome = option;
+    initStyleOption(&chrome, index);
+    chrome.text.clear();
+    const QWidget *widget = option.widget;
+    QStyle *style = widget ? widget->style() : QApplication::style();
+    style->drawControl(QStyle::CE_ItemViewItem, &chrome, painter, widget);
+
+    const QFontMetrics metrics(option.font);
+    const QSize chipSize = TagChip::sizeFor(metrics, account);
+    const QRect chipRect(option.rect.left() + TagChip::kSpacing,
+                         option.rect.top()
+                             + (option.rect.height() - chipSize.height()) / 2,
+                         chipSize.width(), chipSize.height());
+
+    const QColor colour =
+        index.data(ThreadListModel::AccountColourRole).value<QColor>();
+    TagChip::paint(painter, chipRect, account,
+                   colour.isValid() ? colour : QColor(0x55, 0x55, 0x5f));
+
+    // The subject follows the chip, elided so a long one cannot overflow.
+    QRect textRect = option.rect;
+    textRect.setLeft(chipRect.right() + TagChip::kSpacing * 2);
+    if (textRect.width() <= 0)
+        return;
+
+    painter->save();
+    // The model supplies the row's colours; honouring them keeps a deleted
+    // thread white-on-red here as everywhere else.
+    const QVariant foreground = index.data(Qt::ForegroundRole);
+    if (foreground.isValid())
+        painter->setPen(foreground.value<QBrush>().color());
+    else if (option.state & QStyle::State_Selected)
+        painter->setPen(option.palette.highlightedText().color());
+    else
+        painter->setPen(option.palette.text().color());
+
+    // The model's font carries bold for unread and strike-out for deleted.
+    // initStyleOption() already resolved it into chrome.font; using it rather
+    // than option.font is what keeps those cues on a delegate-drawn subject.
+    const QVariant fontData = index.data(Qt::FontRole);
+    const QFont rowFont = fontData.isValid() ? fontData.value<QFont>()
+                                             : chrome.font;
+    painter->setFont(rowFont);
+    const QFontMetrics rowMetrics(rowFont);
+    painter->drawText(textRect, Qt::AlignVCenter | Qt::AlignLeft,
+                      rowMetrics.elidedText(index.data(Qt::DisplayRole).toString(),
+                                            Qt::ElideRight, textRect.width()));
+    painter->restore();
+}
+
+QSize SubjectDelegate::sizeHint(const QStyleOptionViewItem &option,
+                                const QModelIndex &index) const
+{
+    QSize size = QStyledItemDelegate::sizeHint(option, index);
+    const QString account =
+        index.data(ThreadListModel::AccountLabelRole).toString();
+    if (!account.isEmpty()) {
+        const QFontMetrics metrics(option.font);
+        size.setWidth(size.width() + TagChip::sizeFor(metrics, account).width()
+                      + TagChip::kSpacing * 3);
+    }
+    return size;
+}