Wallpaper refining (#81)

* Wallpaper refining

- Swww: allow all images formats supported by Swww but only show the one
we can render in the panel
- Fix: timer should be restarted when selecting a wallpaper
- Fix: avoid recomputing selected thumbnail by altering the border width
- Removed LazyLoader as it was not helping

* Wallpapers changes

- revert: maintaining a single list all wallpapers, support only basic
images format.
- settings: reordered wallpapers settings and made the Swww settings
conditionals to activating the useSWWW toggle

* Fix broken avatar display in Panel, Settings and LockScreen

---------

Co-authored-by: Sébastien Atoch <sebastien@atracktiv.com>

Widgets/Sidebar/Panel/WallpaperPanel.qml

@@ -30,7 +30,7 @@ PanelWindow {
     }
 
     onVisibleChanged: {
-        if (wallpaperPanelLoader.active) {
+        if (wallpaperPanel.visible) {
             wallpapers = WallpaperManager.wallpaperList
         } else {
             wallpapers = []
@@ -81,7 +81,9 @@ PanelWindow {
                         id: closeButtonArea
                         anchors.fill: parent
                         hoverEnabled: true
-                        onClicked: wallpaperPanelLoader.active = false;
+                        onClicked: {
+                            wallpaperPanel.visible =  false;
+                        }
                         cursorShape: Qt.PointingHandCursor
                     }
                 }
@@ -114,7 +116,7 @@ PanelWindow {
                         cellWidth: Math.max(120, (scrollView.width / 3) - 12)
                         cellHeight: cellWidth * 0.6
                         model: wallpapers
-                        cacheBuffer: 32
+                        cacheBuffer: 64
                         leftMargin: 8
                         rightMargin: 8
                         topMargin: 8
@@ -129,27 +131,24 @@ PanelWindow {
                                 color: Qt.darker(Theme.backgroundPrimary, 1.1)
                                 radius: 12
                                 border.color: Settings.settings.currentWallpaper === modelData ? Theme.accentPrimary : Theme.outline
-                                border.width: Settings.settings.currentWallpaper === modelData ? 3 : 1
+                                border.width: 2
                                 Image {
                                     id: wallpaperImage
                                     anchors.fill: parent
                                     source: modelData
                                     fillMode: Image.PreserveAspectCrop
                                     asynchronous: true
-                                    cache: false
+                                    cache: true
                                     smooth: true
                                     mipmap: true
-                                    // Limit memory usage
-                                    sourceSize.width: 480
-                                    sourceSize.height: 270
-                                }
-                                Rectangle {
-                                    anchors.fill: parent
-                                    color: Theme.textPrimary
-                                    opacity: (wallpaperImage.status == Image.Ready) ? 0.0 : 1.0
+                                    // Limit memory usage - FullHD/4 on width and height
+                                    sourceSize.width: Math.min(width, 480)
+                                    sourceSize.height: Math.min(height, 270)
+                                    // Opacity animation once image is ready
+                                    opacity: (wallpaperImage.status == Image.Ready) ? 1.0 : 0.0
                                     Behavior on opacity {
                                         NumberAnimation {
-                                            duration: 500
+                                            duration: 300
                                             easing.type: Easing.OutCubic
                                         }
                                     }