Add Application search to qube settings

resolves: QubesOS/qubes-issues#10276

Author: alimirjamali

qubesmanager/settings.py

@@ -261,6 +261,8 @@ def __init__(
             self.app_list_manager = AppmenuSelectManager(self.vm, self.app_list)
             self.refresh_apps_button.clicked.connect(self.refresh_apps_button_pressed)
 
+            self.app_search.textChanged.connect(self.filter_apps)
+
             # Enable Drag & Drop between between two panels
             # ToDo: Disable D&D between multiple instances of qubes-vm-settings
             # - by overriding QListWidget.dragMoveEvent event
@@ -1669,6 +1671,22 @@ def refresh_apps_button_pressed(self):
         self.threads_list.append(thread)
         thread.start()
 
+    def filter_apps(self):
+        for i in range(self.app_list.available_list.count()):
+            found = re.search(
+                self.app_search.text(),
+                self.app_list.available_list.item(i).text(),
+                re.IGNORECASE
+            )
+            self.app_list.available_list.item(i).setHidden(False if found else True)
+        for i in range(self.app_list.selected_list.count()):
+            found = re.search(
+                self.app_search.text(),
+                self.app_list.selected_list.item(i).text(),
+                re.IGNORECASE
+            )
+            self.app_list.selected_list.item(i).setHidden(False if found else True)
+
     def refresh_finished(self):
         self.app_list_manager = AppmenuSelectManager(self.vm, self.app_list)
         self.refresh_apps_button.setEnabled(True)

ui/settingsdlg.ui

@@ -1883,6 +1883,20 @@ The qube must be running to disable seamless mode. This setting is not persisten
           </widget>
          </item>
          <item row="1" column="0">
+          <layout class="QHBoxLayout" name="horizontalLayoutAppSearch">
+           <item>
+            <widget class="QLabel" name="labelAppSearch">
+             <property name="text">
+              <string>Search for application:</string>
+             </property>
+            </widget>
+           </item>
+           <item>
+            <widget class="QLineEdit" name="app_search"/>
+           </item>
+          </layout>
+         </item>
+         <item row="2" column="0">
           <layout class="QVBoxLayout" name="apps_layout"/>
          </item>
         </layout>