[kwinrules] Allow negative numbers in position

This was limited by the range of the edition spinbox, not by the
rules mechanism which already allowed it.

BUG: 428083


(cherry picked from commit 3d80665c)

kcmkwin/kwinrules/package/contents/ui/ValueEditor.qml

@@ -142,8 +142,9 @@ Loader {
             id: coordItem
             spacing: Kirigami.Units.smallSpacing
 
-            readonly property var coord: (controlType == RuleItem.Size) ? Qt.size(coordX.value, coordY.value)
-                                                                        : Qt.point(coordX.value, coordY.value)
+            readonly property bool isSize: controlType == RuleItem.Size
+            readonly property var coord: (isSize) ? Qt.size(coordX.value, coordY.value)
+                                                  : Qt.point(coordX.value, coordY.value)
             onCoordChanged: valueEditor.valueEdited(coord)
 
             QQC2.SpinBox {
@@ -151,9 +152,9 @@ Loader {
                 editable: true
                 Layout.preferredWidth: 50   // 50%
                 Layout.fillWidth: true
-                from: 0
+                from: (isSize) ? 0 : -32767
                 to: 32767
-                value: (controlType == RuleItem.Size) ? ruleValue.width : ruleValue.x
+                value: (isSize) ? ruleValue.width : ruleValue.x
             }
             QQC2.Label {
                 id: coordSeparator
@@ -164,11 +165,11 @@ Loader {
             QQC2.SpinBox {
                 id: coordY
                 editable: true
-                from: 0
-                to: 32767
+                from: coordX.from
+                to: coordX.to
                 Layout.preferredWidth: 50   // 50%
                 Layout.fillWidth: true
-                value: (controlType == RuleItem.Size) ? ruleValue.height : ruleValue.y
+                value: (isSize) ? ruleValue.height : ruleValue.y
             }
         }
     }

kcmkwin/kwinrules/ruleitem.cpp

@@ -208,8 +208,10 @@ QVariant RuleItem::typedValue(const QVariant &value) const
             }
             return typesMask;
         }
-        case Point:
-            return value.toPoint();
+        case Point: {
+            const QPoint point = value.toPoint();
+            return (point == invalidPoint) ? QPoint(0, 0) : point;
+        }
         case Size:
             return value.toSize();
         case String: