fix: keep keyboard focus on the credential field

Bind each field's focus to the stage so the greeter's window
activation has a focus target and focus follows the stage switch.
The startup focusStage() ran while the view was still hidden, where
forceActiveFocus() is dropped, so re-ask once from a short one-shot
timer after the view is on screen.

Verified in sddm-greeter --test-mode: username focused at start,
password focused after advancing.

1 files changed, 12 insertions, 1 deletions

diff --git a/theme/components/Credentials.qml b/theme/components/Credentials.qml
index f565474..f6fa0bf 100644
--- a/theme/components/Credentials.qml
+++ b/theme/components/Credentials.qml
@@ -45,7 +45,16 @@ Item {
     }
 
     onStageChanged: focusStage()
-    Component.onCompleted: focusStage()
+
+    // The greeter creates the QML before it shows the view, so a focus call at
+    // component completion lands while the window is still hidden and is
+    // dropped. Ask again once the view is on screen; from then on the field's
+    // focus binding follows the stage.
+    Timer {
+        interval: 200
+        running: true
+        onTriggered: creds.focusStage()
+    }
 
     // Back chevron, password stage only. The width animates so the slot grows
     // and shrinks with it.
@@ -147,6 +156,7 @@ Item {
             height: slot.height
             text: userModel.lastUser !== undefined ? userModel.lastUser : ""
             placeholderText: "Username"
+            focus: !creds.passwordStage
             activeFocusOnTab: !creds.passwordStage
             font.family: "Noto Sans"
             color: config.stringValue("text")
@@ -177,6 +187,7 @@ Item {
             height: slot.height
             echoMode: TextInput.Password
             placeholderText: "Password"
+            focus: creds.passwordStage
             activeFocusOnTab: creds.passwordStage
             font.family: "Noto Sans"
             color: config.stringValue("text")