Report unavailable protocols and services; send combos as real keys

Diagnostics collects what this session doesn't allow, logs it, and lists
it in the settings panel (with a dot on the gear): KWin not launching
sloposk as its keyboard (detected by WAYLAND_SOCKET, since KWin offers the
input-method global to every client), fake input missing or too old,
org.kde.keyboard unreachable, and the D-Bus control name taken.

Modifier combos go through fake input even in text fields: KWin drops
the input method's modifier mask for most clients, so Ctrl+A typed "a".

The desktop file is generated with an absolute Exec, which KWin needs to
match it: one for the installed binary, one for the build's.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

qml/Main.qml

@@ -7,6 +7,7 @@ Window {
     required property LayoutModel layoutModel
     required property KeyboardController controller
     required property Settings settings
+    required property Diagnostics diagnostics
     property var placement: null // FloatingWindow, set from C++
     property bool settingsOpen: false
     // Height of the key area, for C++ keeping key sizes when rows change.
@@ -58,6 +59,7 @@ Window {
             visible: root.settingsOpen
             settings: root.settings
             layoutModel: root.layoutModel
+            diagnostics: root.diagnostics
         }
 
         DragHandle {
@@ -69,6 +71,7 @@ Window {
         SettingsButton {
             anchors { left: parent.left; leftMargin: 8; bottom: parent.bottom }
             checked: root.settingsOpen
+            alert: root.diagnostics.problems.length > 0
             onClicked: root.settingsOpen = !root.settingsOpen
         }
 

qml/ProblemList.qml

@@ -0,0 +1,26 @@
+import QtQuick
+
+// What doesn't work in this session and why (see Diagnostics); hidden when all is well.
+Column {
+    id: list
+
+    property list<string> problems
+
+    visible: problems.length > 0
+    spacing: 4
+
+    SectionHeader { text: qsTr("Not Available"); color: Theme.warning }
+
+    Repeater {
+        model: list.problems
+
+        Text {
+            required property string modelData
+            width: list.width
+            text: "⚠ " + modelData
+            color: Theme.text
+            font.pixelSize: 13
+            wrapMode: Text.Wrap
+        }
+    }
+}

qml/SettingsButton.qml

@@ -5,6 +5,8 @@ Item {
     id: button
 
     property bool checked: false
+    // Something doesn't work (see Diagnostics): a dot invites a look in settings.
+    property bool alert: false
     signal clicked()
 
     implicitWidth: 36
@@ -17,6 +19,16 @@ Item {
         color: tap.pressed ? Theme.text : Theme.handle
     }
 
+    Rectangle {
+        visible: button.alert && !button.checked
+        width: 6
+        height: 6
+        radius: 3
+        color: Theme.warning
+        x: parent.width / 2 + 6
+        y: 3
+    }
+
     TapHandler {
         id: tap
         onTapped: button.clicked()

qml/SettingsPanel.qml

@@ -8,101 +8,113 @@ Flickable {
 
     required property Settings settings
     required property LayoutModel layoutModel
+    required property Diagnostics diagnostics
 
     clip: true
-    contentHeight: columns.height + 2 * columns.y
+    contentHeight: content.height + 2 * content.y
     boundsBehavior: Flickable.StopAtBounds
 
-    Row {
-        id: columns
-        readonly property real columnWidth: (width - spacing) / 2
-
+    Column {
+        id: content
         x: 16
         y: 16
         width: panel.width - 2 * x
-        spacing: 32
+        spacing: 16
 
-        Column {
-            width: columns.columnWidth
-            spacing: 4
-
-            SectionHeader { text: qsTr("Typing") }
-
-            ToggleRow {
-                width: parent.width
-                text: qsTr("Auto-Capitalization")
-                detail: qsTr("Shift at the start of a sentence")
-                checked: panel.settings.autoCapitalize
-                onToggled: checked => panel.settings.autoCapitalize = checked
-            }
-
-            ToggleRow {
-                width: parent.width
-                text: qsTr("Hold Keys")
-                detail: qsTr("Keys stay down while touched, like a hardware keyboard; no accents or flicks")
-                checked: panel.settings.holdKeys
-                onToggled: checked => panel.settings.holdKeys = checked
-            }
-
-            ToggleRow {
-                width: parent.width
-                text: qsTr("Always Show")
-                detail: qsTr("Type into any window, not just text fields")
-                checked: panel.settings.alwaysVisible
-                onToggled: checked => panel.settings.alwaysVisible = checked
-            }
-
-            ToggleRow {
-                width: parent.width
-                text: qsTr("“.” Shortcut")
-                detail: qsTr("Double-tap space for a period and a space")
-                checked: panel.settings.doubleSpacePeriod
-                onToggled: checked => panel.settings.doubleSpacePeriod = checked
-            }
-
-            SectionHeader { text: qsTr("Appearance"); topPadding: 12 }
-
-            SliderRow {
-                width: parent.width
-                text: qsTr("Background")
-                from: panel.settings.minBackgroundOpacity
-                value: panel.settings.backgroundOpacity
-                onMoved: value => panel.settings.backgroundOpacity = value
-            }
-
-            ToggleRow {
-                width: parent.width
-                text: qsTr("Blur Behind")
-                detail: qsTr("Frosted glass under a see-through background, if the desktop supports it")
-                checked: panel.settings.blurBackground
-                onToggled: checked => panel.settings.blurBackground = checked
-            }
+        ProblemList {
+            width: parent.width
+            problems: panel.diagnostics.problems
         }
 
-        Column {
-            width: columns.columnWidth
-            spacing: 4
+        Row {
+            id: columns
+            readonly property real columnWidth: (width - spacing) / 2
 
-            SectionHeader { text: qsTr("Keys") }
+            width: parent.width
+            spacing: 32
 
-            ToggleRow {
-                width: parent.width
-                text: qsTr("Full Keyboard")
-                detail: qsTr("Number row, tab, ctrl, alt — like iPad Pro")
-                checked: panel.settings.fullKeyboard
-                onToggled: checked => panel.settings.fullKeyboard = checked
-            }
+            Column {
+                width: columns.columnWidth
+                spacing: 4
 
-            Repeater {
-                // "main" is the typing keys; the rest come from the template.
-                model: [{ id: "main", name: qsTr("Typing keys") }].concat(panel.layoutModel.sections)
+                SectionHeader { text: qsTr("Typing") }
 
                 ToggleRow {
-                    required property var modelData
                     width: parent.width
-                    text: modelData.name
-                    checked: panel.settings.visibleSections.includes(modelData.id)
-                    onToggled: checked => panel.settings.setSectionVisible(modelData.id, checked)
+                    text: qsTr("Auto-Capitalization")
+                    detail: qsTr("Shift at the start of a sentence")
+                    checked: panel.settings.autoCapitalize
+                    onToggled: checked => panel.settings.autoCapitalize = checked
+                }
+
+                ToggleRow {
+                    width: parent.width
+                    text: qsTr("Hold Keys")
+                    detail: qsTr("Keys stay down while touched, like a hardware keyboard; no accents or flicks")
+                    checked: panel.settings.holdKeys
+                    onToggled: checked => panel.settings.holdKeys = checked
+                }
+
+                ToggleRow {
+                    width: parent.width
+                    text: qsTr("Always Show")
+                    detail: qsTr("Type into any window, not just text fields")
+                    checked: panel.settings.alwaysVisible
+                    onToggled: checked => panel.settings.alwaysVisible = checked
+                }
+
+                ToggleRow {
+                    width: parent.width
+                    text: qsTr("“.” Shortcut")
+                    detail: qsTr("Double-tap space for a period and a space")
+                    checked: panel.settings.doubleSpacePeriod
+                    onToggled: checked => panel.settings.doubleSpacePeriod = checked
+                }
+
+                SectionHeader { text: qsTr("Appearance"); topPadding: 12 }
+
+                SliderRow {
+                    width: parent.width
+                    text: qsTr("Background")
+                    from: panel.settings.minBackgroundOpacity
+                    value: panel.settings.backgroundOpacity
+                    onMoved: value => panel.settings.backgroundOpacity = value
+                }
+
+                ToggleRow {
+                    width: parent.width
+                    text: qsTr("Blur Behind")
+                    detail: qsTr("Frosted glass under a see-through background, if the desktop supports it")
+                    checked: panel.settings.blurBackground
+                    onToggled: checked => panel.settings.blurBackground = checked
+                }
+            }
+
+            Column {
+                width: columns.columnWidth
+                spacing: 4
+
+                SectionHeader { text: qsTr("Keys") }
+
+                ToggleRow {
+                    width: parent.width
+                    text: qsTr("Full Keyboard")
+                    detail: qsTr("Number row, tab, ctrl, alt — like iPad Pro")
+                    checked: panel.settings.fullKeyboard
+                    onToggled: checked => panel.settings.fullKeyboard = checked
+                }
+
+                Repeater {
+                    // "main" is the typing keys; the rest come from the template.
+                    model: [{ id: "main", name: qsTr("Typing keys") }].concat(panel.layoutModel.sections)
+
+                    ToggleRow {
+                        required property var modelData
+                        width: parent.width
+                        text: modelData.name
+                        checked: panel.settings.visibleSections.includes(modelData.id)
+                        onToggled: checked => panel.settings.setSectionVisible(modelData.id, checked)
+                    }
                 }
             }
         }

qml/Theme.qml

@@ -16,6 +16,7 @@ QtObject {
     readonly property color accent: dark ? "#0a84ff" : "#007aff"
     readonly property color accentText: "#ffffff"
     readonly property color toggleOn: dark ? "#30d158" : "#34c759"
+    readonly property color warning: dark ? "#ff9f0a" : "#ff9500"
 
     readonly property real windowRadius: 14
     readonly property real keyRadius: 6