Mac App Launcher is positioned on center of dock in certain cases.

chrome/browser/ui/app_list/app_list_service_mac.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/app_list/app_list_service_mac.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 #import <Cocoa/Cocoa.h>
 
 #include "apps/app_shim/app_shim_mac.h"
@@ skipping 57 matching lines @@
          targetOrigin:(NSPoint)targetOrigin
               closing:(BOOL)closing;
 
 @end
 
 namespace {
 
 // Version of the app list shortcut version installed.
 const int kShortcutVersion = 1;
 
+// If the mouse cursor is less than this distance, in pixels, away from the
+// dock, it is considered to be in the dock for the purpose of anchoring.
+const int kSnapDistance = 50;

[tapted, 2013/11/29 02:12:51]

I think this should be at least window width for a left/right dock, and at least
window height for a bottom dock. It really bugs me when I use the Windows app
launcher, and I know where I need to click when it appears, but because it took
too long, the window decided not to pop up there.

[tapted, 2013/11/29 06:05:59]

Did you see this?

[Matt Giuca, 2013/12/02 05:02:03]

Yes, I made a note to get to it on Monday.

Yes, I agree. Done.

+
 // Duration of show and hide animations.
 const NSTimeInterval kAnimationDuration = 0.2;
 
 // Distance towards the screen edge that the app list moves from when showing.
 const CGFloat kDistanceMovedOnShow = 20;
 
 ShellIntegration::ShortcutInfo GetAppListShortcutInfo(
     const base::FilePath& profile_path) {
   ShellIntegration::ShortcutInfo shortcut_info;
   chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
@@ skipping 185 matching lines @@
 
 // static
 void AppListServiceMac::FindAnchorPoint(const gfx::Size& window_size,
                                         const gfx::Display& display,
                                         int primary_display_height,
                                         bool cursor_is_visible,
                                         const gfx::Point& cursor,
                                         NSPoint* target_origin,
                                         NSPoint* start_origin) {
   AppListPositioner positioner(display, window_size, 0);
-  AppListPositioner::ScreenEdge dock_location =
-      AppListPositioner::SCREEN_EDGE_UNKNOWN;
+  AppListPositioner::ScreenEdge dock_location = DockLocationInDisplay(display);
+
   gfx::Point anchor;
-  if (!cursor_is_visible) {
+  // Snap to the dock edge. If the cursor is greater than kSnapDistance away or
+  // not visible, anchor to the center of the dock. Otherwise, anchor to the
+  // cursor position.
+  if (dock_location == AppListPositioner::SCREEN_EDGE_UNKNOWN) {
     anchor = positioner.GetAnchorPointForScreenCorner(
         AppListPositioner::SCREEN_CORNER_BOTTOM_LEFT);
   } else {
-    dock_location = DockLocationInDisplay(display);
-
-    // Snap to the dock edge, anchored to the cursor position.
-    if (dock_location == AppListPositioner::SCREEN_EDGE_UNKNOWN) {
-      anchor = positioner.GetAnchorPointForScreenCorner(
-          AppListPositioner::SCREEN_CORNER_BOTTOM_LEFT);
+    // Subtract the dock area since the display's default work_area will not
+    // subtract it if the dock is set to auto-hide, and the app list should
+    // never overlap the dock.
+    AdjustWorkAreaForDock(display, &positioner, dock_location);
+    if (!cursor_is_visible || positioner.GetCursorDistanceFromShelf(
+                                  dock_location, cursor) > kSnapDistance) {
+      anchor = positioner.GetAnchorPointForShelfCenter(dock_location);
     } else {
-      // Subtract the dock area since the display's default work_area will not
-      // subtract it if the dock is set to auto-hide, and the app list should
-      // never overlap the dock.
-      AdjustWorkAreaForDock(display, &positioner, dock_location);
       anchor = positioner.GetAnchorPointForShelfCursor(dock_location, cursor);
     }
   }
 
   *target_origin = NSMakePoint(
       anchor.x() - window_size.width() / 2,
       primary_display_height - anchor.y() - window_size.height() / 2);
   *start_origin = *target_origin;
 
   switch (dock_location) {
@@ skipping 232 matching lines @@
 
 - (void)animationDidEnd:(NSAnimation*)animation {
   [window_ close];
   window_.reset();
   animation_.reset();
 
   apps::AppShimHandler::MaybeTerminate();
 }
 
 @end