Fix the issue that a panel window cannot be shrink to very small

views/widget/native_widget_win.cc

 // Copyright (c) 2011 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.
 
 #include "views/widget/native_widget_win.h"
 
 #include <dwmapi.h>
 #include <shellapi.h>
 
 #include "base/string_util.h"
@@ skipping 2163 matching lines @@
   if (params.transparent)
     ex_style |= WS_EX_LAYERED;
   if (params.has_dropshadow) {
     class_style |= (base::win::GetVersion() < base::win::VERSION_XP) ?
         0 : CS_DROPSHADOW;
   }
 
   // Set type-dependent style attributes.
   switch (params.type) {
     case Widget::InitParams::TYPE_WINDOW: {
+      // Do not pass other styles if custom frame is used. This is because
+      // oherwise the height of the window cannot be shrinked beyond certain
+      // point.
+      if (GetWidget()->frame_type() == Widget::FRAME_TYPE_FORCE_CUSTOM) {

[Ben Goodger (Google), 2011/06/23 20:48:55]

This is incorrect. Custom frame windows need to have standard window styles,
otherwise various sizing functionality will not work.

+        style |= WS_POPUP;
+        break;
+      }
+
       style |= WS_SYSMENU | WS_CAPTION;
       bool can_resize = GetWidget()->widget_delegate()->CanResize();
       bool can_maximize = GetWidget()->widget_delegate()->CanMaximize();
       if (can_maximize) {
         style |= WS_OVERLAPPEDWINDOW;
       } else if (can_resize) {
         style |= WS_OVERLAPPED | WS_THICKFRAME;
       }
       if (delegate_->IsDialogBox()) {
         style |= DS_MODALFRAME;
@@ skipping 307 matching lines @@
 
   // And now, notify them that they have a brand new parent.
   for (Widget::Widgets::iterator it = widgets.begin();
        it != widgets.end(); ++it) {
     (*it)->NotifyNativeViewHierarchyChanged(true, new_parent);
   }
 }
 
 }  // namespace internal
 }  // namespace views