fix(tiling): Windows launching onto window that isn't focused

Author: mmstick

src/auto_tiler.ts

@@ -202,6 +202,7 @@ export class AutoTiler {
             log.debug(`attach to workspace: ${result.value}`)
             this.attach_to_workspace(ext, win, ext.workspace_id(win));
         } else {
+            log.debug(`attaching to window ${win.entity}`)
             this.attach_to_window(ext, result.value, win,  { auto: 0 })
         }
     }
@@ -656,7 +657,7 @@ export class AutoTiler {
             return Err('ignoring focus');
         }
 
-        const prev = ext.prev_focused[1]
+        const prev = ext.prev_focused[0]
 
         if (!prev) {
             return Err('no window has been previously focused');

src/extension.ts

@@ -792,8 +792,11 @@ export class Ext extends Ecs.System<ExtEvent> {
             this.exception_add(win)
         }
 
-        this.prev_focused[0] = this.prev_focused[1];
-        this.prev_focused[1] = win.entity;
+        // Track history of focused windows, but do not permit duplicates.
+        if (this.prev_focused[1] !== win.entity) {
+            this.prev_focused[0] = this.prev_focused[1];
+            this.prev_focused[1] = win.entity;
+        }
 
         // Update the active tab in the stack.
         if (null !== this.auto_tiler && null !== win.stack) {