Building plasma-desktop/applets/taskmanager by itself

0-SoloBuildTaskManager.sh

# Download
git clone git://anongit.kde.org/plasma-desktop
cd plasma-desktop

# Apply patch
git apply 1-taskmanager-cmakelist.diff
cd applets/taskmanager

# Build
mkdir -p build
cd build
cmake .. -DCMAKE_BUILD_TYPE=Debug -DBUILD_TESTING=OFF -DKDE_INSTALL_USE_QT_SYS_PATHS=ON
make
sudo make install
cd ..


# Debugging
git apply 2-Debugging-Bug401579.diff
( cd build \
   && cmake .. -DCMAKE_BUILD_TYPE=Debug -DBUILD_TESTING=OFF -DKDE_INSTALL_USE_QT_SYS_PATHS=ON \
   && make \
   && sudo make install \
)

1-taskmanager-cmakelist.diff

diff --git a/applets/taskmanager/CMakeLists.txt b/applets/taskmanager/CMakeLists.txt
index 63f779fd..46d50361 100644
--- a/applets/taskmanager/CMakeLists.txt
+++ b/applets/taskmanager/CMakeLists.txt
@@ -1,3 +1,39 @@
+cmake_minimum_required(VERSION 3.0)
+
+project(plasma-desktop)
+
+set(PROJECT_VERSION "5.14.80")
+set(PROJECT_VERSION_MAJOR 5)
+
+set(QT_MIN_VERSION "5.11.0")
+set(KF5_MIN_VERSION "5.50.0")
+
+find_package(ECM ${ECM_MIN_VERSION} REQUIRED NO_MODULE)
+set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR} ${CMAKE_MODULE_PATH})
+
+include(KDEInstallDirs)
+include(KDECMakeSettings)
+include(KDECompilerSettings NO_POLICY_SCOPE)
+
+find_package(Qt5 ${QT_MIN_VERSION} REQUIRED COMPONENTS
+    Core
+    Gui
+    DBus
+    Widgets
+    Quick
+)
+find_package(KF5 REQUIRED COMPONENTS
+    CoreAddons
+    Declarative
+    DocTools
+    GlobalAccel
+    I18n
+    Plasma
+    KIO
+    Activities
+    ActivitiesStats
+)
+
 add_definitions(-DTRANSLATION_DOMAIN=\"plasma_applet_org.kde.plasma.taskmanager\")
 
 plasma_install_package(package org.kde.plasma.taskmanager)

2-Debugging-Bug401579.diff

diff --git a/applets/taskmanager/plugin/backend.cpp b/applets/taskmanager/plugin/backend.cpp
index 3bdfbeb4..416cb931 100644
--- a/applets/taskmanager/plugin/backend.cpp
+++ b/applets/taskmanager/plugin/backend.cpp
@@ -319,7 +319,7 @@ QVariantList Backend::recentDocumentActions(const QUrl &launcherUrl, QObject *pa
 
     while (actionCount < 5 && resultIt != results.end()) {
         const QString resource = (*resultIt).resource();
-        const QUrl url(resource);
+        QUrl url(resource);
 
         if (!url.isValid()) {
             continue;
@@ -331,8 +331,18 @@ QVariantList Backend::recentDocumentActions(const QUrl &launcherUrl, QObject *pa
             continue;
         }
 
+        if (url.scheme() == QStringLiteral("")) {
+            url.setScheme("file");
+        }
+
         QAction *action = new QAction(parent);
         action->setText(url.fileName());
+        qDebug() << "url:" << url;
+        qDebug() << "   scheme:" << url.scheme();
+        qDebug() << "   isLocal:" << url.isLocalFile();
+        qDebug() << "   isDir:" << fileItem.isDir();
+        qDebug() << "   icon:" << fileItem.iconName();
+        
         action->setIcon(QIcon::fromTheme(fileItem.iconName(), QIcon::fromTheme(QStringLiteral("unknown"))));
         action->setProperty("agent", storageId);
         action->setProperty("entryPath", desktopEntryUrl);