fix(ui): keep Space for playback after mouse clicks

Controls take focus only via Tab, so a click leaves Space for playback.

src/qml/Header.qml

@@ -12,7 +12,8 @@ import org.kde.kirigami as Kirigami
 ToolBar {
     id: root
 
-    // Space activates the focused control before the window's playback action.
+    // Space activates the focused control before the window's playback action. The
+    // controls take focus only from Tab, so a click leaves Space for playback.
     Keys.onShortcutOverride: event => {
         if (event.key === Qt.Key_Space && event.modifiers === Qt.NoModifier) {
             event.accepted = true
@@ -40,14 +41,14 @@ ToolBar {
             actions: root.actions
             mpv: root.mpv
             visible: !root.menuBarShown
-            focusPolicy: Qt.StrongFocus
+            focusPolicy: Qt.TabFocus
             icon.width: root.buttonSize
             icon.height: root.buttonSize
         }
 
         ToolButton {
             action: root.actions.openFile
-            focusPolicy: Qt.StrongFocus
+            focusPolicy: Qt.TabFocus
             icon.width: root.buttonSize
             icon.height: root.buttonSize
             display: root.isSmallSize ? AbstractButton.IconOnly : AbstractButton.TextBesideIcon
@@ -59,7 +60,7 @@ ToolBar {
 
         ToolButton {
             action: root.actions.openUrl
-            focusPolicy: Qt.StrongFocus
+            focusPolicy: Qt.TabFocus
             icon.width: root.buttonSize
             icon.height: root.buttonSize
             display: root.isSmallSize ? AbstractButton.IconOnly : AbstractButton.TextBesideIcon
@@ -77,7 +78,7 @@ ToolBar {
             icon.name: "add-subtitle"
             icon.width: root.buttonSize
             icon.height: root.buttonSize
-            focusPolicy: Qt.StrongFocus
+            focusPolicy: Qt.TabFocus
             enabled: root.mpv.fileLoaded
             opacity: enabled ? 1.0 : 0.6
             display: root.isSmallSize ? AbstractButton.IconOnly : AbstractButton.TextBesideIcon
@@ -111,7 +112,7 @@ ToolBar {
             icon.name: "audio-volume-high"
             icon.width: root.buttonSize
             icon.height: root.buttonSize
-            focusPolicy: Qt.StrongFocus
+            focusPolicy: Qt.TabFocus
             enabled: root.mpv.audioTracks.length > 0
             opacity: enabled ? 1.0 : 0.6
             display: root.isSmallSize ? AbstractButton.IconOnly : AbstractButton.TextBesideIcon
@@ -162,7 +163,7 @@ ToolBar {
             ToolButton {
                 action: root.actions.cancelTranslation
                 display: AbstractButton.IconOnly
-                focusPolicy: Qt.StrongFocus
+                focusPolicy: Qt.TabFocus
 
                 ToolTip.text: text
                 ToolTip.visible: hovered
@@ -176,7 +177,7 @@ ToolBar {
 
         ToolButton {
             action: root.actions.configure
-            focusPolicy: Qt.StrongFocus
+            focusPolicy: Qt.TabFocus
             icon.width: root.buttonSize
             icon.height: root.buttonSize
             display: root.isSmallSize ? AbstractButton.IconOnly : AbstractButton.TextBesideIcon