windows: size floating windows from the preferred height when only a placeholder screen is left

ref #3545

quickshell/Common/SettingsTabs.qml

@@ -571,7 +571,7 @@ Singleton {
                     "id": "updater_changelog",
                     "hidden": true,
                     "text": I18n.tr("Release notes", "settings page and card title, notes for a DMS release"),
-                    "icon": "auto_awesome",
+                    "icon": "article",
                     "tabIndex": 66,
                     "hint": I18n.tr("Summary, highlights, links", "settings sidebar hint for the release notes page")
                 },

quickshell/Modals/Changelog/ChangelogModal.qml

@@ -8,7 +8,7 @@ DFloatingWindow {
     id: root
 
     readonly property int modalWidth: 720
-    readonly property int modalHeight: screen ? Math.min(800, screen.height - 80) : 800
+    readonly property int modalHeight: heightWithin(800, 80)
 
     signal changelogDismissed
 
@@ -88,7 +88,7 @@ DFloatingWindow {
                 id: notesButton
                 anchors.verticalCenter: parent.verticalCenter
                 text: I18n.tr("Release notes", "settings page and card title, notes for a DMS release")
-                iconName: "auto_awesome"
+                iconName: "article"
                 buttonHeight: Theme.buttonHeightM
                 backgroundColor: Theme.secondaryContainer
                 textColor: Theme.onSecondaryContainer
@@ -109,7 +109,7 @@ DFloatingWindow {
             DFab {
                 anchors.verticalCenter: parent.verticalCenter
                 text: "Let's go"
-                iconName: "rocket_launch"
+                iconName: "check"
                 colorRole: "primary"
                 onClicked: root.dismiss()
             }

quickshell/Modals/Greeter/GreeterModal.qml

@@ -17,7 +17,7 @@ DFloatingWindow {
     property bool cheatsheetLoaded: false
 
     readonly property int modalWidth: 720
-    readonly property int modalHeight: screen ? Math.min(760, screen.height - 80) : 760
+    readonly property int modalHeight: heightWithin(760, 80)
 
     signal greeterCompleted
 

quickshell/Modals/Greeter/GreeterWelcomePage.qml

@@ -14,7 +14,7 @@ Item {
     readonly property real cardWidth: (content.width - Theme.spacingS * (columns - 1)) / columns
     readonly property var features: [
         {
-            "icon": "auto_awesome",
+            "icon": "palette",
             "shape": "softBurst",
             "hoverShape": "flower",
             "accent": "purple",

quickshell/Modals/KeybindsModalWindow.qml

@@ -28,7 +28,7 @@ DFloatingWindow {
     title: I18n.tr("Keybinds")
     minimumSize: Qt.size(Math.min(560, Screen.width), Math.min(400, Screen.height))
     implicitWidth: 1000
-    implicitHeight: screen ? Math.min(820, screen.height - 100) : 820
+    implicitHeight: heightWithin(820, 100)
     visible: false
 
     onVisibleChanged: {

quickshell/Modals/Settings/SettingsModal.qml

@@ -173,7 +173,7 @@ DFloatingWindow {
     title: I18n.tr("Settings", "settings window title")
     minimumSize: Qt.size(SettingsMetrics.windowMinWidth, SettingsMetrics.windowMinHeight)
     implicitWidth: SettingsMetrics.windowWidth
-    implicitHeight: screen ? Math.min(SettingsMetrics.windowHeight, screen.height - SettingsMetrics.pagePaddingH * 2 - Theme.spacingL) : SettingsMetrics.windowHeight
+    implicitHeight: heightWithin(SettingsMetrics.windowHeight, SettingsMetrics.pagePaddingH * 2 + Theme.spacingL)
     visible: false
 
     onClosed: hide()

quickshell/Modals/SystemUpdateModal.qml

@@ -22,7 +22,7 @@ DFloatingWindow {
     minimumSize: Qt.size(SettingsMetrics.windowMinWidth, SettingsMetrics.windowMinHeight)
     implicitWidth: SettingsMetrics.formDialogWidth + SettingsMetrics.pagePaddingH * 2
     readonly property real defaultHeight: SettingsMetrics.windowHeight - SettingsMetrics.pagePaddingV * 4
-    implicitHeight: screen ? Math.min(defaultHeight, screen.height - SettingsMetrics.pagePaddingH * 2 - Theme.spacingL) : defaultHeight
+    implicitHeight: heightWithin(defaultHeight, SettingsMetrics.pagePaddingH * 2 + Theme.spacingL)
     visible: false
 
     Ref {

quickshell/Modules/Settings/SoftwareUpdatesTab.qml

@@ -386,7 +386,7 @@ Item {
             SettingsNavRow {
                 visible: root.notesRelease !== null
                 title: I18n.tr("Release notes", "settings page and card title, notes for a DMS release")
-                iconName: "auto_awesome"
+                iconName: "article"
                 hint: root.notesRelease?.codename ? "v" + root.notesRelease.version + " · " + root.notesRelease.codename : "v" + (root.notesRelease?.version ?? "")
                 onClicked: keyboard => root.parentModal?.navigateTo("updater_changelog", keyboard)
             }

quickshell/Widgets/DFloatingWindow.qml

@@ -14,6 +14,12 @@ FloatingWindow {
     property color surfaceColor: Theme.floatingWindowSurface
     property bool contentVisible: true
 
+    // A placeholder screen (no outputs left) is 0x0; a size derived from it is a zero geometry and the compositor drops the connection.
+    function heightWithin(preferred, inset) {
+        const available = (root.screen?.height ?? 0) - inset;
+        return available > 0 ? Math.min(preferred, available) : preferred;
+    }
+
     color: "transparent"
 
     Rectangle {