[plasma/kwin] src/utils: Make top/bottom/left/right gravity center window along orthogonal axis

Git commit 43e1f4ee28b9e1fc15b98f3c5b76d864ad0dca91 by Vlad Zahorodnii.
Committed on 03/08/2026 at 13:24.
Pushed by vladz into branch 'master'.

Make top/bottom/left/right gravity center window along orthogonal axis

This makes kwin center windows with aspect ratio along orthogonal axis.
For example, if you resize a window by dragging the left edge, the
window will be centered vertically.

I would like kwin to center toplevels if their size changes
spontaneously, this takes kwin one step closer to that goal. Centering
the window produces less awkward results in those cases.

M  +15   -3    src/utils/gravity.cpp

https://invent.kde.org/plasma/kwin/-/commit/43e1f4ee28b9e1fc15b98f3c5b76d864ad0dca91

diff --git a/src/utils/gravity.cpp b/src/utils/gravity.cpp
index f538915273c..6334ddbeb0e 100644
--- a/src/utils/gravity.cpp
+++ b/src/utils/gravity.cpp
@@ -34,22 +34,34 @@ RectF Gravity::apply(const RectF &rect, const RectF &bounds) const
         geometry.moveBottom(bounds.bottom());
         break;
     case Gravity::Top:
+        geometry.moveBottom(bounds.bottom());
+        geometry.moveHorizontalCenter(bounds.horizontalCenter());
+        break;
     case Gravity::TopRight:
         geometry.moveLeft(bounds.left());
         geometry.moveBottom(bounds.bottom());
         break;
     case Gravity::Right:
-    case Gravity::BottomRight:
-    case Gravity::Bottom:
+        geometry.moveLeft(bounds.left());
+        geometry.moveVerticalCenter(bounds.verticalCenter());
+        break;
     case Gravity::None:
+    case Gravity::BottomRight:
         geometry.moveLeft(bounds.left());
         geometry.moveTop(bounds.top());
         break;
+    case Gravity::Bottom:
+        geometry.moveHorizontalCenter(bounds.horizontalCenter());
+        geometry.moveTop(bounds.top());
+        break;
     case Gravity::BottomLeft:
-    case Gravity::Left:
         geometry.moveRight(bounds.right());
         geometry.moveTop(bounds.top());
         break;
+    case Gravity::Left:
+        geometry.moveRight(bounds.right());
+        geometry.moveVerticalCenter(bounds.verticalCenter());
+        break;
     }
 
     return geometry;