Indeterminate progress bar styling

TODO.md

@@ -58,7 +58,6 @@
 - UI
   - Show error if uploading avatar fails or file is corrupted
   - Way to open context menus without a right mouse button
-  - Indeterminate progress bar
   - `smartVerticalFlick()` gradual acceleration
 
   - Link previews

src/qml/Base/HProgressBar.qml

@@ -18,9 +18,19 @@ ProgressBar {
         implicitHeight: theme.controls.progressBar.height
 
         Rectangle {
-            width: bar.visualPosition * parent.width
+            id: indicator
+            width: bar.indeterminate ?
+                   parent.width / 8 : bar.visualPosition * parent.width
             height: parent.height
             color: foregroundColor
+
+            XAnimator on x {
+                running: indeterminate
+                duration: theme.animationDuration * 8
+                from: 0
+                to: bar.width - indicator.width
+                onStopped: {[from, to] = [to, from]; start()}
+            }
         }
     }
 }

src/qml/Chat/UploadsBar.qml

@@ -97,7 +97,7 @@ Rectangle {
 
             HProgressBar {
                 id: progressBar
-
+                indeterminate: true
                 Layout.fillWidth: true
             }
         }