diff --git a/src/main.ts b/src/main.ts
index 52bb3c4..66ff526 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -165,11 +165,26 @@ export default function () {
   let lastNativePosKey = '' // canvas-space key of last native-drag position (to detect titlebar drags)
   const dockInterval = setInterval(function () {
     if (dockedPosition !== null) {
-      const b = figma.viewport.bounds
-      const key = `${b.x}|${b.y}|${b.width}|${b.height}`
-      if (key !== lastBoundsKey) {
-        lastBoundsKey = key
-        applyDock(dockedPosition, lastSize.width, lastSize.height, false)
+      // Keep the docked window pinned to its edge. Re-pin whenever it has drifted
+      // from the computed target — this catches zoom/pan (figma.viewport.bounds
+      // change) AND a Figma UI panel resize (Figma shifts the plugin window to
+      // stay visible, but viewport.bounds may not change, so a bounds-key check
+      // alone misses it). A docked window is meant to stay put, so snapping a
+      // stray drift back to the edge is the desired behaviour.
+      const target = computeDockPos(dockedPosition, lastSize.width, lastSize.height)
+      try {
+        const pos = (figma.ui as any).getPosition()
+        const drift = Math.abs(Math.round(pos.canvasSpace.x) - Math.round(target.x)) +
+                      Math.abs(Math.round(pos.canvasSpace.y) - Math.round(target.y))
+        if (drift > 2) figma.ui.reposition(target.x, target.y)
+      } catch (e) {
+        // getPosition unavailable — fall back to the bounds-key trigger.
+        const b = figma.viewport.bounds
+        const key = `${b.x}|${b.y}|${b.width}|${b.height}`
+        if (key !== lastBoundsKey) {
+          lastBoundsKey = key
+          applyDock(dockedPosition, lastSize.width, lastSize.height, false)
+        }
       }
       return
     }