kde-plasma/khotkeys: Fix systemsettings crash in hotkeys handling

KDE-bug: https://bugs.kde.org/show_bug.cgi?id=443656
Upstream commit a4137ac8f7b18824568fbee0f3e2dce7551841b7

Package-Manager: Portage-3.0.28, Repoman-3.0.3
Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>

2 files changed, 170 insertions, 0 deletions

diff --git a/kde-plasma/khotkeys/files/khotkeys-5.23.3-delete-widgets-w-entry.patch b/kde-plasma/khotkeys/files/khotkeys-5.23.3-delete-widgets-w-entry.patch
new file mode 100644
index 000000000000..9e8ae22f2d53
--- /dev/null
+++ b/kde-plasma/khotkeys/files/khotkeys-5.23.3-delete-widgets-w-entry.patch
@@ -0,0 +1,118 @@
+From a4137ac8f7b18824568fbee0f3e2dce7551841b7 Mon Sep 17 00:00:00 2001
+From: Harald Sitter <sitter@kde.org>
+Date: Wed, 13 Oct 2021 13:52:15 +0200
+Subject: [PATCH] when deleting an entry, also delete the widgets
+
+previously what would happen is that KCMHotkeys::currentChanged would
+run, find the new index (-1,-1) now invalid and show the global settings
+instead. this however left the simple_action's underlying widgets still
+sitting around referring to the previous index AND holding a dangling
+trigger point that would eventually crash when the simple_action would
+be poked by anything
+
+instead force unset the internal state of the simple_action when showing
+the global settings.
+
+FIXED-IN: 5.23.5
+BUG: 443656
+
+
+(cherry picked from commit 97f9339fd96d97e012347f8f7fca987bbe4fca0d)
+---
+ kcm_hotkeys/kcm_hotkeys.cpp                  |  3 +++
+ kcm_hotkeys/simple_action_data_widget.cpp    | 18 +++++++++++-------
+ kcm_hotkeys/simple_action_data_widget.h      |  3 +++
+ kcm_hotkeys/triggers/trigger_widget_base.cpp |  8 ++++++++
+ 4 files changed, 25 insertions(+), 7 deletions(-)
+
+diff --git a/kcm_hotkeys/kcm_hotkeys.cpp b/kcm_hotkeys/kcm_hotkeys.cpp
+index d3ed315..4dc4664 100644
+--- a/kcm_hotkeys/kcm_hotkeys.cpp
++++ b/kcm_hotkeys/kcm_hotkeys.cpp
+@@ -120,6 +120,9 @@ void KCMHotkeys::currentChanged(const QModelIndex &pCurrent, const QModelIndex &
+     }
+ 
+     if (!current.isValid()) {
++        if (previous.isValid()) { // throw away old widget and stuff lest we have dangling pointers https://bugs.kde.org/show_bug.cgi?id=443656
++            d->simple_action->unsetActionData();
++        }
+         return showGlobalSettings();
+     }
+ 
+diff --git a/kcm_hotkeys/simple_action_data_widget.cpp b/kcm_hotkeys/simple_action_data_widget.cpp
+index e20ccaa..eb8c4c1 100644
+--- a/kcm_hotkeys/simple_action_data_widget.cpp
++++ b/kcm_hotkeys/simple_action_data_widget.cpp
+@@ -60,14 +60,22 @@ void SimpleActionDataWidget::doCopyToObject()
+     }
+ }
+ 
+-void SimpleActionDataWidget::setActionData(KHotKeys::SimpleActionData *pData)
++void SimpleActionDataWidget::unsetActionData()
+ {
+-    _data = pData;
++    _data = nullptr;
+ 
+-    // Now go and work on the trigger
+     delete currentTrigger;
+     currentTrigger = nullptr;
+ 
++    delete currentAction;
++    currentAction = nullptr;
++}
++
++void SimpleActionDataWidget::setActionData(KHotKeys::SimpleActionData *pData)
++{
++    unsetActionData();
++    _data = pData;
++
+     if (KHotKeys::Trigger *trg = data()->trigger()) {
+         switch (trg->type()) {
+         case KHotKeys::Trigger::ShortcutTriggerType:
+@@ -95,10 +103,6 @@ void SimpleActionDataWidget::setActionData(KHotKeys::SimpleActionData *pData)
+         extend(currentTrigger, i18n("Trigger"));
+     }
+ 
+-    // Now go and work on the action
+-    delete currentAction;
+-    currentAction = nullptr;
+-
+     if (KHotKeys::Action *act = data()->action()) {
+         switch (act->type()) {
+         case KHotKeys::Action::MenuEntryActionType:
+diff --git a/kcm_hotkeys/simple_action_data_widget.h b/kcm_hotkeys/simple_action_data_widget.h
+index bc203b1..7c347c5 100644
+--- a/kcm_hotkeys/simple_action_data_widget.h
++++ b/kcm_hotkeys/simple_action_data_widget.h
+@@ -32,6 +32,9 @@ public:
+      */
+     void setActionData(KHotKeys::SimpleActionData *action);
+ 
++    /// Throws away the held widgets and state.
++    void unsetActionData();
++
+     KHotKeys::SimpleActionData *data()
+     {
+         return static_cast<KHotKeys::SimpleActionData *>(_data);
+diff --git a/kcm_hotkeys/triggers/trigger_widget_base.cpp b/kcm_hotkeys/triggers/trigger_widget_base.cpp
+index 67f4f3e..3bfa39b 100644
+--- a/kcm_hotkeys/triggers/trigger_widget_base.cpp
++++ b/kcm_hotkeys/triggers/trigger_widget_base.cpp
+@@ -10,6 +10,14 @@ TriggerWidgetBase::TriggerWidgetBase(KHotKeys::Trigger *trigger, QWidget *parent
+     : HotkeysWidgetIFace(parent)
+     , _trigger(trigger)
+ {
++    // Safety net to catch use-after-free. The triggers are not held or managed by us nor our parent.
++    // Makes them easier to spot, unlike https://bugs.kde.org/show_bug.cgi?id=443656
++    auto qObject = dynamic_cast<QObject *>(trigger);
++    if (qObject) {
++        connect(qObject, &QObject::destroyed, this, [this] {
++            _trigger = nullptr;
++        });
++    }
+ }
+ 
+ TriggerWidgetBase::~TriggerWidgetBase()
+-- 
+GitLab
+
diff --git a/kde-plasma/khotkeys/khotkeys-5.23.3-r1.ebuild b/kde-plasma/khotkeys/khotkeys-5.23.3-r1.ebuild
new file mode 100644
index 000000000000..19b406f848a4
--- /dev/null
+++ b/kde-plasma/khotkeys/khotkeys-5.23.3-r1.ebuild
@@ -0,0 +1,52 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+ECM_HANDBOOK="forceoptional" # not optional until !kdelibs4support
+KFMIN=5.86.0
+PVCUT=$(ver_cut 1-3)
+QTMIN=5.15.2
+inherit ecm kde.org
+
+DESCRIPTION="KDE Plasma workspace hotkey module"
+
+LICENSE="GPL-2" # TODO: CHECK
+SLOT="5"
+KEYWORDS="~amd64 ~arm ~arm64 ~ppc64 ~riscv ~x86"
+IUSE=""
+
+COMMON_DEPEND="
+	>=dev-qt/qtdbus-${QTMIN}:5
+	>=dev-qt/qtgui-${QTMIN}:5
+	>=dev-qt/qtwidgets-${QTMIN}:5
+	>=dev-qt/qtx11extras-${QTMIN}:5
+	>=kde-frameworks/kcompletion-${KFMIN}:5
+	>=kde-frameworks/kconfig-${KFMIN}:5
+	>=kde-frameworks/kconfigwidgets-${KFMIN}:5
+	>=kde-frameworks/kcoreaddons-${KFMIN}:5
+	>=kde-frameworks/kdbusaddons-${KFMIN}:5
+	>=kde-frameworks/kdelibs4support-${KFMIN}:5[X]
+	>=kde-frameworks/kglobalaccel-${KFMIN}:5
+	>=kde-frameworks/ki18n-${KFMIN}:5
+	>=kde-frameworks/kio-${KFMIN}:5
+	>=kde-frameworks/kservice-${KFMIN}:5
+	>=kde-frameworks/ktextwidgets-${KFMIN}:5
+	>=kde-frameworks/kwidgetsaddons-${KFMIN}:5
+	>=kde-frameworks/kwindowsystem-${KFMIN}:5
+	>=kde-frameworks/kxmlgui-${KFMIN}:5
+	>=kde-plasma/libkworkspace-${PVCUT}:5
+	x11-libs/libX11
+	x11-libs/libXtst
+"
+DEPEND="${COMMON_DEPEND}
+	x11-base/xorg-proto
+	x11-libs/libxcb
+	x11-libs/libXtst
+"
+RDEPEND="${COMMON_DEPEND}
+	>=kde-frameworks/kded-${KFMIN}:5
+	>=kde-plasma/kde-cli-tools-${PVCUT}:5
+"
+
+PATCHES=( "${FILESDIR}"/${P}-delete-widgets-w-entry.patch ) # KDE-bug 443656