make grid-scroll-focused center the focused column

src/actions.ts

@@ -216,7 +216,7 @@ function initActions(world: World) {
             }
             const column = focusedWindow.column;
             const grid = column.grid;
-            grid.scrollToColumn(column);
+            grid.scrollCenterColumn(column);
             grid.arrange();
         },
 

src/keyBindings/definition.ts

@@ -121,7 +121,7 @@ const keyBindings: KeyBinding[] = [
     },
     {
         "name": "grid-scroll-focused",
-        "description": "Scroll to focused window",
+        "description": "Center focused window",
         "defaultKeySequence": "Meta+Alt+Return",
         "action": "gridScrollFocused",
     },

src/layout/Grid.ts

@@ -153,6 +153,12 @@ class Grid {
         }
     }
 
+    scrollCenterColumn(column: Column) {
+        const windowCenter = column.gridX + column.width / 2 + this.world.config.gapsInnerHorizontal - this.scrollX; // in screen space
+        const screenCenter = this.tilingArea.x + this.tilingArea.width / 2;
+        this.adjustScroll(Math.round(windowCenter - screenCenter), false);
+    }
+
     autoAdjustScroll() {
         const focusedWindow = this.world.getFocusedWindow();
         if (focusedWindow === null) {