Add hackaround for Qt bug to all non-horizontally-scrollable scrollviews

https://bugreports.qt.io/browse/QTBUG-83890 has been open for years with
a patch that's been stalled for years. There's no indication that it's
going to be fixed anytime soon, and it generates bug reports for us.
Let's add the typical hackaround for all non-horizontally-scrollable
scrollviews.

BUG: 457584

imports/NeoChat/Component/ChatBox/ChatBar.qml

@@ -63,6 +63,9 @@ ToolBar {
             Layout.maximumHeight: fontMetrics.lineSpacing * 8 - fontMetrics.leading
                                 + inputField.topPadding + inputField.bottomPadding
 
+            // HACK: Hide unnecessary horizontal scrollbar (https://bugreports.qt.io/browse/QTBUG-83890)
+            ScrollBar.horizontal.policy: ScrollBar.AlwaysOff
+
             FontMetrics {
                 id: fontMetrics
                 font: inputField.font

imports/NeoChat/Component/ChatBox/CompletionMenu.qml

@@ -47,6 +47,7 @@ Popup {
     implicitHeight: Math.min(completionListView.contentHeight, Kirigami.Units.gridUnit * 10)
 
     contentItem: ScrollView {
+        // HACK: Hide unnecessary horizontal scrollbar (https://bugreports.qt.io/browse/QTBUG-83890)
         ScrollBar.horizontal.policy: ScrollBar.AlwaysOff
         ListView {
             id: completionListView

imports/NeoChat/Component/ChatBox/ReplyPane.qml

@@ -71,6 +71,10 @@ Loader {
                     Layout.alignment: Qt.AlignLeft | Qt.AlignTop
                     Layout.fillWidth: true
                     Layout.maximumHeight: fontMetrics.lineSpacing * 8 - fontMetrics.leading
+
+                    // HACK: Hide unnecessary horizontal scrollbar (https://bugreports.qt.io/browse/QTBUG-83890)
+                    ScrollBar.horizontal.policy: ScrollBar.AlwaysOff
+
                     TextArea {
                         id: textArea
                         leftPadding: 0

imports/NeoChat/Menu/Timeline/MessageSourceSheet.qml

@@ -22,6 +22,10 @@ Kirigami.Page {
     ScrollView {
         anchors.fill: parent
         contentWidth: availableWidth
+
+        // HACK: Hide unnecessary horizontal scrollbar (https://bugreports.qt.io/browse/QTBUG-83890)
+        ScrollBar.horizontal.policy: ScrollBar.AlwaysOff
+
         TextArea {
             id: sourceTextArea
             text: sourceText

imports/NeoChat/Panel/RoomDrawer.qml

@@ -217,6 +217,9 @@ Kirigami.OverlayDrawer {
                 Layout.fillWidth: true
                 Layout.fillHeight: true
 
+                // HACK: Hide unnecessary horizontal scrollbar (https://bugreports.qt.io/browse/QTBUG-83890)
+                ScrollBar.horizontal.policy: ScrollBar.AlwaysOff
+
                 ListView {
                     id: userListView
                     clip: true

imports/NeoChat/Settings/SonnetConfigPage.qml

@@ -190,6 +190,10 @@ Kirigami.Page {
             Layout.fillHeight: true
             enabled: autodetectLanguageCheckbox.checked
             Component.onCompleted: background.visible = wideMode
+
+            // HACK: Hide unnecessary horizontal scrollbar (https://bugreports.qt.io/browse/QTBUG-83890)
+            QQC2.ScrollBar.horizontal.policy: QQC2.ScrollBar.AlwaysOff
+
             ListView {
                 clip: true
                 model: settings.dictionaryModel
@@ -254,6 +258,10 @@ Kirigami.Page {
             }
             QQC2.ScrollView {
                 anchors.fill: parent
+
+                // HACK: Hide unnecessary horizontal scrollbar (https://bugreports.qt.io/browse/QTBUG-83890)
+                QQC2.ScrollBar.horizontal.policy: QQC2.ScrollBar.AlwaysOff
+
                 ListView {
                     model: settings.currentIgnoreList
                     delegate: Kirigami.BasicListItem {