fix(qt): Shift and Ctrl work on every select-mode click target, not only the row body

Excel-style selection (750c59034) read the modifiers only where a row BODY
took the click. Every other target a select-mode surface draws dropped them,
so a Shift-click there was a plain toggle:

  - the track row's checkbox disc passed Qt.NoModifier;
  - QbzCheckbox and SelectCheck emitted toggled() with no argument, so the
    Library album rows, the local album rows and the folder rows, which
    already expected `function (mods)`, received undefined;
  - AlbumCard emitted selectToggled() with no argument, and the paged local
    albums grid (299dcde5b) spelled the drop out as Qt.NoModifier.

Some targets were never selection targets at all: in select mode the artist
and album names on a track row, the artist and label on a Library album row
and the artist line of an album card still navigated, leaving the page and
the selection mid-gesture. The row links stand down in select mode so the
click reaches the row body with its modifiers, and the card's artist line
toggles like its artwork and title. A hover-only tooltip on the pulled but
cached glyph no longer eats the row's click.

Reproduced on the release binary in a nested KWin with injected input: in
Local Library Tracks, the checkbox discs of rows 1, Shift 4 and Ctrl 6
selected 3 rows; the same clicks on the row bodies selected 5. No list
view, Flickable or wheel code changes; tst_wheel passes unchanged.

tst_multi_select clicks each of these targets through the real TrackRow,
AlbumListRow, AlbumCard, QbzCheckbox and SelectCheck.

cc

scripts/qml-tests/imports/com/blitzfc/qbz/QbzAlbum.qml

@@ -0,0 +1,7 @@
+pragma Singleton
+import QtQuick
+QtObject {
+    property var opened: []
+    function openAlbum(id) { opened = opened.concat([String(id)]) }
+    function openAlbumFrom(id, title, artist) { opened = opened.concat([String(id)]) }
+}

scripts/qml-tests/imports/com/blitzfc/qbz/QbzArtist.qml

@@ -0,0 +1,6 @@
+pragma Singleton
+import QtQuick
+QtObject {
+    property var opened: []
+    function openArtist(id) { opened = opened.concat([String(id)]) }
+}

scripts/qml-tests/imports/com/blitzfc/qbz/QbzHome.qml

@@ -0,0 +1,6 @@
+pragma Singleton
+import QtQuick
+QtObject {
+    property var labels: []
+    function openLabel(id) { labels = labels.concat([String(id)]) }
+}

scripts/qml-tests/imports/com/blitzfc/qbz/QbzSearch.qml

@@ -0,0 +1,6 @@
+pragma Singleton
+import QtQuick
+QtObject {
+    property var submitted: []
+    function searchSubmit(text) { submitted = submitted.concat([String(text)]) }
+}

scripts/qml-tests/imports/com/blitzfc/qbz/qmldir

@@ -9,3 +9,7 @@ singleton QbzPurchases 1.0 QbzPurchases.qml
 singleton QbzOrbit 1.0 QbzOrbit.qml
 
 singleton QbzAbout 1.0 QbzAbout.qml
+singleton QbzArtist 1.0 QbzArtist.qml
+singleton QbzAlbum 1.0 QbzAlbum.qml
+singleton QbzSearch 1.0 QbzSearch.qml
+singleton QbzHome 1.0 QbzHome.qml

scripts/qml-tests/tst_multi_select.qml

@@ -8,11 +8,278 @@ import QtQuick
 import QtTest
 import com.blitzfc.qbz
 import "../../crates/qbz-qt/qml/controls"
+import "../../crates/qbz-qt/qml/rows"
+import "../../crates/qbz-qt/qml/cards"
+import "../../crates/qbz-qt/qml/views" as Views
+import "../../crates/qbz-qt/qml/views/local" as Local
 
 Item {
     id: root
     width: 1200; height: 1400
 
+    function track(i) {
+        return { "id": "t" + i, "title": "Track " + i, "artist": "Artist " + i,
+                 "artistId": "a" + i, "album": "Album " + i, "albumId": "al" + i,
+                 "duration": "3:00", "qualityTier": "", "qualityDetail": "" }
+    }
+    function album(i) {
+        return { "id": "b" + i, "title": "Record " + i, "artist": "Band " + i,
+                 "artistId": "band" + i, "label": "Label " + i, "labelId": "l" + i,
+                 "year": "2001", "qualityTier": "", "qualityDetail": "" }
+    }
+    function range(n, make) {
+        var out = []
+        for (var i = 0; i < n; i++)
+            out.push(make(i))
+        return out
+    }
+
+    // ---- the track list (AlbumView / PlaylistView wiring) -------------------
+    property var tracks: range(8, track)
+    property var trackSelected: ({})
+    SelectionModel { id: trackSel }
+    function toggleTrack(id, mods) {
+        root.trackSelected = trackSel.next(root.trackSelected, id, root.tracks,
+                                           mods === undefined ? Qt.NoModifier : mods)
+    }
+
+    Column {
+        id: trackColumn
+        width: 1000
+        Repeater {
+            id: trackRepeater
+            model: root.tracks
+            delegate: TrackRow {
+                required property var modelData
+                required property int index
+                width: 1000
+                item: modelData
+                number: index + 1
+                artistLink: true
+                showAlbum: true
+                selectMode: true
+                checked: root.trackSelected[modelData.id] === true
+                onToggleSelect: function (mods) { root.toggleTrack(modelData.id, mods) }
+            }
+        }
+    }
+
+    // ---- the album list (Library albums list wiring) ------------------------
+    property var albums: range(6, album)
+    property var albumSelected: ({})
+    SelectionModel { id: albumSel }
+    function toggleAlbum(id, mods) {
+        root.albumSelected = albumSel.next(root.albumSelected, id, root.albums,
+                                           mods === undefined ? Qt.NoModifier : mods)
+    }
+
+    Column {
+        id: albumColumn
+        y: 420
+        width: 1000
+        Repeater {
+            id: albumRepeater
+            model: root.albums
+            delegate: Views.AlbumListRow {
+                required property var modelData
+                required property int index
+                width: 1000
+                item: modelData
+                rowIndex: index
+                selectMode: true
+                checked: root.albumSelected[modelData.id] === true
+                onToggleSelect: function (mods) { root.toggleAlbum(modelData.id, mods) }
+            }
+        }
+    }
+
+    // ---- one album card and the two checkbox controls ------------------------
+    property var cardMods: []
+    AlbumCard {
+        id: card
+        x: 1000; y: 0
+        albumId: "card"
+        title: "Card title"
+        artist: "Card artist"
+        artistId: "card-artist"
+        selectMode: true
+        onSelectToggled: function (mods) { root.cardMods = root.cardMods.concat([mods]) }
+    }
+
+    property var checkboxMods: []
+    QbzCheckbox {
+        id: checkbox
+        x: 1000; y: 320
+        onToggled: function (mods) { root.checkboxMods = root.checkboxMods.concat([mods]) }
+    }
+    property var selectCheckMods: []
+    Local.SelectCheck {
+        id: selectCheck
+        x: 1040; y: 320
+        onToggled: function (mods) { root.selectCheckMods = root.selectCheckMods.concat([mods]) }
+    }
+
+    TestCase {
+        name: "MultiSelect"
+        when: windowShown
+
+        function find(item, pred) {
+            if (!item)
+                return null
+            if (pred(item))
+                return item
+            var kids = item.children || []
+            for (var i = 0; i < kids.length; i++) {
+                var hit = find(kids[i], pred)
+                if (hit)
+                    return hit
+            }
+            return null
+        }
+        function shown(item) {
+            for (var it = item; it; it = it.parent)
+                if (!it.visible)
+                    return false
+            return true
+        }
+        function textItem(host, text) {
+            var t = find(host, function (it) {
+                return it.text === text && it.contentWidth !== undefined && shown(it)
+            })
+            verify(t !== null, "text '" + text + "' is drawn")
+            return t
+        }
+        // Clicks go through the window at the item's position, so whichever
+        // MouseArea really sits on top there receives them — the point of
+        // using the real components.
+        function clickOn(item, x, y, mods) {
+            var p = item.mapToItem(root, x, y)
+            mouseClick(root, p.x, p.y, Qt.LeftButton, mods === undefined ? Qt.NoModifier : mods)
+            wait(20)
+        }
+        function selectedIds(map) {
+            return Object.keys(map).sort().join(",")
+        }
+        function trackRow(i) { return trackRepeater.itemAt(i) }
+        function albumRow(i) { return albumRepeater.itemAt(i) }
+        function disc(row) {
+            var d = find(row, function (it) {
+                return it.width === 14 && it.height === 14 && it.hoverEnabled !== undefined
+                    && it.cursorShape !== undefined && shown(it)
+            })
+            verify(d !== null, "the select-mode disc is drawn")
+            return d
+        }
+
+        function init() {
+            root.trackSelected = ({})
+            trackSel.anchorId = ""
+            root.albumSelected = ({})
+            albumSel.anchorId = ""
+            root.cardMods = []
+            root.checkboxMods = []
+            root.selectCheckMods = []
+            QbzArtist.opened = []
+            QbzAlbum.opened = []
+            QbzHome.labels = []
+        }
+
+        // A point of the row with nothing drawn over it but the body: the
+        // duration cell.
+        function bodyPoint(row) {
+            var duration = textItem(row, "3:00")
+            return duration.mapToItem(row, duration.width / 2, duration.height / 2)
+        }
+        function clickBody(row, mods) {
+            var p = bodyPoint(row)
+            clickOn(row, p.x, p.y, mods)
+        }
+
+        function test_row_body_shift_and_ctrl() {
+            clickBody(trackRow(1))
+            clickBody(trackRow(4), Qt.ShiftModifier)
+            compare(selectedIds(root.trackSelected), "t1,t2,t3,t4")
+            clickBody(trackRow(6), Qt.ControlModifier)
+            compare(selectedIds(root.trackSelected), "t1,t2,t3,t4,t6")
+        }
+
+        function test_checkbox_disc_shift_and_ctrl() {
+            clickOn(disc(trackRow(0)), 7, 7)
+            clickOn(disc(trackRow(3)), 7, 7, Qt.ShiftModifier)
+            compare(selectedIds(root.trackSelected), "t0,t1,t2,t3",
+                    "Shift on the disc selects the range")
+            clickOn(disc(trackRow(5)), 7, 7, Qt.ControlModifier)
+            clickOn(disc(trackRow(7)), 7, 7, Qt.ControlModifier | Qt.ShiftModifier)
+            compare(selectedIds(root.trackSelected), "t0,t1,t2,t3,t5,t6,t7",
+                    "Ctrl adds a row and Ctrl+Shift adds a second group")
+        }
+
+        function test_artist_link_selects_in_select_mode() {
+            clickBody(trackRow(2))
+            var name = textItem(trackRow(5), "Artist 5")
+            clickOn(name, 10, name.height / 2, Qt.ShiftModifier)
+            compare(QbzArtist.opened.length, 0, "no artist page opens in select mode")
+            compare(selectedIds(root.trackSelected), "t2,t3,t4,t5")
+        }
+
+        function test_album_link_selects_in_select_mode() {
+            var name = textItem(trackRow(6), "Album 6")
+            clickOn(name, 10, name.height / 2)
+            compare(QbzAlbum.opened.length, 0, "no album page opens in select mode")
+            compare(selectedIds(root.trackSelected), "t6")
+        }
+
+        function test_album_row_checkbox_shift_range() {
+            var first = find(albumRow(0), function (it) {
+                return it.checked !== undefined && it.width === 18 && it.height === 18 && shown(it)
+            })
+            var fourth = find(albumRow(3), function (it) {
+                return it.checked !== undefined && it.width === 18 && it.height === 18 && shown(it)
+            })
+            verify(first !== null && fourth !== null, "the album row checkboxes are drawn")
+            clickOn(first, 9, 9)
+            clickOn(fourth, 9, 9, Qt.ShiftModifier)
+            compare(selectedIds(root.albumSelected), "b0,b1,b2,b3")
+        }
+
+        function test_album_row_links_select_in_select_mode() {
+            clickOn(albumRow(1), 600, 32)
+            var band = textItem(albumRow(4), "Band 4")
+            clickOn(band, 10, band.height / 2, Qt.ShiftModifier)
+            compare(QbzArtist.opened.length, 0, "no artist page opens in select mode")
+            var label = textItem(albumRow(5), "Label 5")
+            clickOn(label, 10, label.height / 2, Qt.ControlModifier)
+            compare(QbzHome.labels.length, 0, "no label page opens in select mode")
+            compare(selectedIds(root.albumSelected), "b1,b2,b3,b4,b5")
+        }
+
+        function test_album_card_forwards_modifiers() {
+            clickOn(card, 100, 100, Qt.ShiftModifier)
+            var title = textItem(card, "Card title")
+            clickOn(title, 10, title.height / 2, Qt.ControlModifier)
+            var artist = textItem(card, "Card artist")
+            clickOn(artist, 10, artist.height / 2, Qt.ShiftModifier)
+            compare(QbzArtist.opened.length, 0, "no artist page opens in select mode")
+            compare(root.cardMods.length, 3)
+            verify((root.cardMods[0] & Qt.ShiftModifier) !== 0, "artwork carries Shift")
+            verify((root.cardMods[1] & Qt.ControlModifier) !== 0, "title carries Ctrl")
+            verify((root.cardMods[2] & Qt.ShiftModifier) !== 0, "artist line carries Shift")
+        }
+
+        function test_checkbox_controls_forward_modifiers() {
+            clickOn(checkbox, 9, 9, Qt.ShiftModifier)
+            clickOn(selectCheck, 6, 6, Qt.ControlModifier)
+            compare(root.checkboxMods.length, 1)
+            verify((root.checkboxMods[0] & Qt.ShiftModifier) !== 0, "QbzCheckbox carries Shift")
+            compare(root.selectCheckMods.length, 1)
+            verify((root.selectCheckMods[0] & Qt.ControlModifier) !== 0, "SelectCheck carries Ctrl")
+            checkbox.forceActiveFocus()
+            keyClick(Qt.Key_Space)
+            compare(root.checkboxMods.length, 2)
+            compare(root.checkboxMods[1] & Qt.ShiftModifier, 0, "the keyboard toggle is a plain toggle")
+        }
+    }
+
     // ---- the selection rule itself ---------------------------------------------
     SelectionModel { id: rule }
     SelectionModel { id: keyedRule; idKey: "trackId" }