Remember last used folder in save dialogs

BUG: 460166

src/neochatconfig.kcfg

@@ -62,6 +62,9 @@
       <label>Enable developer tools</label>
       <default>false</default>
     </entry>
+    <entry name="LastSaveDirectory" type="String">
+      <label>Directory last used for saving a file</label>
+    </entry>
   </group>
   <group name="Timeline">
     <entry name="ShowAvatarInTimeline" type="bool">

src/qml/Component/FullScreenImage.qml

@@ -293,8 +293,10 @@ QQC2.Popup {
         id: saveAsDialog
         FileDialog {
             fileMode: FileDialog.SaveFile
-            folder: StandardPaths.writableLocation(StandardPaths.DownloadLocation)
+            folder: Config.lastSaveDirectory.length > 0 ? Config.lastSaveDirectory : StandardPaths.writableLocation(StandardPaths.DownloadLocation)
             onAccepted: {
+                Config.lastSaveDirectory = folder
+                Config.save()
                 if (!currentFile) {
                     return;
                 }

src/qml/Component/Timeline/FileDelegate.qml

@@ -159,11 +159,15 @@ TimelineContainer {
 
             FileDialog {
                 fileMode: FileDialog.SaveFile
-                folder: StandardPaths.writableLocation(StandardPaths.DownloadLocation)
-                onAccepted: if (autoOpenFile) {
-                    UrlHelper.copyTo(progressInfo.localPath, file)
-                } else {
-                    currentRoom.download(eventId, file);
+                folder: Config.lastSaveDirectory.length > 0 ? Config.lastSaveDirectory : StandardPaths.writableLocation(StandardPaths.DownloadLocation)
+                onAccepted: {
+                    Config.lastSaveDirectory = folder
+                    Config.save()
+                    if (autoOpenFile) {
+                        UrlHelper.copyTo(progressInfo.localPath, file)
+                    } else {
+                        currentRoom.download(eventId, file);
+                    }
                 }
             }
         }

src/qml/Menu/Timeline/FileDelegateContextMenu.qml

@@ -113,11 +113,13 @@ MessageDelegateContextMenu {
         id: saveAsDialog
         FileDialog {
             fileMode: FileDialog.SaveFile
-            folder: StandardPaths.writableLocation(StandardPaths.DownloadLocation)
+            folder: Config.lastSaveDirectory.length > 0 ? Config.lastSaveDirectory : StandardPaths.writableLocation(StandardPaths.DownloadLocation)
             onAccepted: {
                 if (!currentFile) {
                     return;
                 }
+                Config.lastSaveDirectory = folder
+                Config.save()
                 currentRoom.downloadFile(eventId, currentFile)
             }
         }