added the caching of the restore state until the list frame gets reset

removed the positioning of the dropdown at the bottom of reflow
r kmcclusk b=21945,25059

layout/forms/nsComboboxControlFrame.cpp

@@ -240,6 +240,17 @@ nsComboboxControlFrame::InitTextStr(nsIPresContext* aPresContext, PRBool aUpdate
 void 
 nsComboboxControlFrame::Reset(nsIPresContext* aPresContext)
 {
+  if (mPresState) {
+    nsIStatefulFrame* sFrame = nsnull;
+    nsresult res = mListControlFrame->QueryInterface(NS_GET_IID(nsIStatefulFrame),
+                                                     (void**)&sFrame);
+    if (NS_SUCCEEDED(res) && sFrame) {
+      res = sFrame->RestoreState(mPresContext, mPresState);
+      NS_RELEASE(sFrame);
+    }
+    mPresState = do_QueryInterface(nsnull);
+  }
+
    // Reset the dropdown list to its original state
   nsIFormControlFrame* fcFrame = nsnull;
   nsIFrame* dropdownFrame = GetDropdownFrame();
@@ -881,11 +892,6 @@ nsComboboxControlFrame::Reflow(nsIPresContext*          aPresContext,
 	  aDesiredSize.maxElementSize->height = aDesiredSize.height;
   }
 
-  nsRect absoluteTwips;
-  nsRect absolutePixels;
-  GetAbsoluteFramePosition(aPresContext, this,  absoluteTwips, absolutePixels);
-  //PositionDropdown(aPresContext, aDesiredSize.height, absoluteTwips, absolutePixels);
-
   aStatus = NS_FRAME_COMPLETE;
 #if 0
   COMPARE_QUIRK_SIZE("nsComboboxControlFrame", 127, 22) 
@@ -1307,6 +1313,7 @@ nsComboboxControlFrame::SetDropDown(nsIFrame* aDropDownFrame)
   mDropdownFrame = aDropDownFrame;
  
   if (NS_OK != mDropdownFrame->QueryInterface(kIListControlFrameIID, (void**)&mListControlFrame)) {
+
     return NS_ERROR_FAILURE;
   }
 
@@ -1735,7 +1742,10 @@ nsComboboxControlFrame::SaveState(nsIPresContext* aPresContext, nsIPresState** a
 NS_IMETHODIMP
 nsComboboxControlFrame::RestoreState(nsIPresContext* aPresContext, nsIPresState* aState)
 {
-  if (!mListControlFrame) return NS_ERROR_UNEXPECTED;
+  if (!mListControlFrame) {
+    mPresState = aState;
+    return NS_OK;
+  }
   nsIStatefulFrame* sFrame = nsnull;
   nsresult res = mListControlFrame->QueryInterface(NS_GET_IID(nsIStatefulFrame),
                                                    (void**)&sFrame);

layout/forms/nsComboboxControlFrame.h

@@ -33,6 +33,7 @@
 #include "nsISelectControlFrame.h"
 #include "nsIStatefulFrame.h"
 #include "nsIRollupListener.h"
+#include "nsIPresState.h"
 
 class nsButtonControlFrame;
 class nsTextControlFrame;
@@ -41,7 +42,6 @@ class nsIView;
 class nsStyleContext;
 class nsIHTMLContent;
 class nsIListControlFrame;
-class nsIPresState;
 
 /**
  * Child list name indices
@@ -215,6 +215,9 @@ protected:
   nsIListControlFrame * mListControlFrame;        // ListControl Interface for the dropdown frame
   PRBool                mIgnoreFocus;             // Tells the combo to ignore all focus notifications
 
+  
+  nsCOMPtr<nsIPresState> mPresState;               // Need cache state when list is null
+
   // Resize Reflow Optimization
   nsSize                mCacheSize;
   nsSize                mCachedMaxElementSize;

layout/html/forms/src/nsComboboxControlFrame.cpp

@@ -240,6 +240,17 @@ nsComboboxControlFrame::InitTextStr(nsIPresContext* aPresContext, PRBool aUpdate
 void 
 nsComboboxControlFrame::Reset(nsIPresContext* aPresContext)
 {
+  if (mPresState) {
+    nsIStatefulFrame* sFrame = nsnull;
+    nsresult res = mListControlFrame->QueryInterface(NS_GET_IID(nsIStatefulFrame),
+                                                     (void**)&sFrame);
+    if (NS_SUCCEEDED(res) && sFrame) {
+      res = sFrame->RestoreState(mPresContext, mPresState);
+      NS_RELEASE(sFrame);
+    }
+    mPresState = do_QueryInterface(nsnull);
+  }
+
    // Reset the dropdown list to its original state
   nsIFormControlFrame* fcFrame = nsnull;
   nsIFrame* dropdownFrame = GetDropdownFrame();
@@ -881,11 +892,6 @@ nsComboboxControlFrame::Reflow(nsIPresContext*          aPresContext,
 	  aDesiredSize.maxElementSize->height = aDesiredSize.height;
   }
 
-  nsRect absoluteTwips;
-  nsRect absolutePixels;
-  GetAbsoluteFramePosition(aPresContext, this,  absoluteTwips, absolutePixels);
-  //PositionDropdown(aPresContext, aDesiredSize.height, absoluteTwips, absolutePixels);
-
   aStatus = NS_FRAME_COMPLETE;
 #if 0
   COMPARE_QUIRK_SIZE("nsComboboxControlFrame", 127, 22) 
@@ -1307,6 +1313,7 @@ nsComboboxControlFrame::SetDropDown(nsIFrame* aDropDownFrame)
   mDropdownFrame = aDropDownFrame;
  
   if (NS_OK != mDropdownFrame->QueryInterface(kIListControlFrameIID, (void**)&mListControlFrame)) {
+
     return NS_ERROR_FAILURE;
   }
 
@@ -1735,7 +1742,10 @@ nsComboboxControlFrame::SaveState(nsIPresContext* aPresContext, nsIPresState** a
 NS_IMETHODIMP
 nsComboboxControlFrame::RestoreState(nsIPresContext* aPresContext, nsIPresState* aState)
 {
-  if (!mListControlFrame) return NS_ERROR_UNEXPECTED;
+  if (!mListControlFrame) {
+    mPresState = aState;
+    return NS_OK;
+  }
   nsIStatefulFrame* sFrame = nsnull;
   nsresult res = mListControlFrame->QueryInterface(NS_GET_IID(nsIStatefulFrame),
                                                    (void**)&sFrame);

layout/html/forms/src/nsComboboxControlFrame.h

@@ -33,6 +33,7 @@
 #include "nsISelectControlFrame.h"
 #include "nsIStatefulFrame.h"
 #include "nsIRollupListener.h"
+#include "nsIPresState.h"
 
 class nsButtonControlFrame;
 class nsTextControlFrame;
@@ -41,7 +42,6 @@ class nsIView;
 class nsStyleContext;
 class nsIHTMLContent;
 class nsIListControlFrame;
-class nsIPresState;
 
 /**
  * Child list name indices
@@ -215,6 +215,9 @@ protected:
   nsIListControlFrame * mListControlFrame;        // ListControl Interface for the dropdown frame
   PRBool                mIgnoreFocus;             // Tells the combo to ignore all focus notifications
 
+  
+  nsCOMPtr<nsIPresState> mPresState;               // Need cache state when list is null
+
   // Resize Reflow Optimization
   nsSize                mCacheSize;
   nsSize                mCachedMaxElementSize;