Bug 119837 - add a parameter to nsITheme::GetMinimumWidgetSize to specify if CSS is allowed to override the min size. r=bzbarsky, sr=hyatt.

gfx/public/nsITheme.h

@@ -62,7 +62,8 @@ public:
 
   NS_IMETHOD GetMinimumWidgetSize(nsIRenderingContext* aContext, nsIFrame* aFrame,
                                   PRUint8 aWidgetType,
-                                  nsSize* aResult)=0;
+                                  nsSize* aResult,
+                                  PRBool* aIsOverridable)=0;
 
   NS_IMETHOD WidgetStateChanged(nsIFrame* aFrame, PRUint8 aWidgetType, 
                                 nsIAtom* aAttribute, PRBool* aShouldRepaint)=0;

gfx/src/gtk/nsNativeThemeGTK.cpp

@@ -333,9 +333,10 @@ nsNativeThemeGTK::GetWidgetBorder(nsIDeviceContext* aContext,
 NS_IMETHODIMP
 nsNativeThemeGTK::GetMinimumWidgetSize(nsIRenderingContext* aContext, nsIFrame* aFrame,
                                        PRUint8 aWidgetType,
-                                       nsSize* aResult)
+                                       nsSize* aResult, PRBool* aIsOverridable)
 {
   aResult->width = aResult->height = 0;
+  *aIsOverridable = PR_TRUE;
 
   switch (aWidgetType) {
     case NS_THEME_SCROLLBAR_BUTTON_UP:

gfx/src/gtk/nsNativeThemeGTK.h

@@ -62,7 +62,8 @@ public:
 
   NS_IMETHOD GetMinimumWidgetSize(nsIRenderingContext* aContext, nsIFrame* aFrame,
                                   PRUint8 aWidgetType,
-                                  nsSize* aResult);
+                                  nsSize* aResult,
+                                  PRBool* aIsOverridable);
 
   NS_IMETHOD WidgetStateChanged(nsIFrame* aFrame, PRUint8 aWidgetType, 
                                 nsIAtom* aAttribute, PRBool* aShouldRepaint);

gfx/src/windows/nsNativeThemeWin.cpp

@@ -783,12 +783,13 @@ nsNativeThemeWin::GetWidgetBorder(nsIDeviceContext* aContext,
 NS_IMETHODIMP
 nsNativeThemeWin::GetMinimumWidgetSize(nsIRenderingContext* aContext, nsIFrame* aFrame,
                                        PRUint8 aWidgetType,
-                                       nsSize* aResult)
+                                       nsSize* aResult, PRBool* aIsOverridable)
 {
   if (!getThemePartSize)
     return NS_ERROR_FAILURE;
 
   (*aResult).width = (*aResult).height = 0;
+  *aIsOverridable = PR_TRUE;
 
   if (aWidgetType == NS_THEME_TOOLBOX || aWidgetType == NS_THEME_TOOLBAR || 
       aWidgetType == NS_THEME_STATUSBAR || aWidgetType == NS_THEME_PROGRESSBAR_CHUNK ||
@@ -964,4 +965,4 @@ NS_METHOD NS_NewNativeTheme(nsISupports *aOuter, REFNSIID aIID, void **aResult)
   if (!theme)
     return NS_ERROR_OUT_OF_MEMORY;
   return theme->QueryInterface(aIID, aResult);
-}
+}

gfx/src/windows/nsNativeThemeWin.h

@@ -45,7 +45,8 @@ public:
 
   NS_IMETHOD GetMinimumWidgetSize(nsIRenderingContext* aContext, nsIFrame* aFrame,
                                   PRUint8 aWidgetType,
-                                  nsSize* aResult);
+                                  nsSize* aResult,
+                                  PRBool* aIsOverridable);
 
   NS_IMETHOD WidgetStateChanged(nsIFrame* aFrame, PRUint8 aWidgetType, 
                                 nsIAtom* aAttribute, PRBool* aShouldRepaint);

layout/xul/base/src/nsBox.cpp

@@ -1275,6 +1275,7 @@ nsIBox::AddCSSMinSize(nsBoxLayoutState& aState, nsIBox* aBox, nsSize& aSize)
 
     PRBool widthSet = PR_FALSE;
     PRBool heightSet = PR_FALSE;
+    PRBool canOverride = PR_TRUE;
 
     nsIFrame* frame = nsnull;
     aBox->GetFrame(&frame);
@@ -1291,7 +1292,7 @@ nsIBox::AddCSSMinSize(nsBoxLayoutState& aState, nsIBox* aBox, nsSize& aSize)
         const nsHTMLReflowState* reflowState = aState.GetReflowState();
         if (reflowState) {
           theme->GetMinimumWidgetSize(reflowState->rendContext, frame, 
-                                      display->mAppearance, &size);
+                                      display->mAppearance, &size, &canOverride);
           float p2t;
           aState.GetPresContext()->GetScaledPixelsToTwips(&p2t);
           aSize.width = NSIntPixelsToTwips(size.width, p2t);
@@ -1313,7 +1314,7 @@ nsIBox::AddCSSMinSize(nsBoxLayoutState& aState, nsIBox* aBox, nsSize& aSize)
     // we will assume 0 means not set.
     if (position->mMinWidth.GetUnit() == eStyleUnit_Coord) {
         nscoord min = position->mMinWidth.GetCoordValue();
-        if (min && (!widthSet || min > aSize.width)) {
+        if (min && (!widthSet || (min > aSize.width && canOverride))) {
            aSize.width = min;
            widthSet = PR_TRUE;
         }
@@ -1321,7 +1322,7 @@ nsIBox::AddCSSMinSize(nsBoxLayoutState& aState, nsIBox* aBox, nsSize& aSize)
 
     if (position->mMinHeight.GetUnit() == eStyleUnit_Coord) {
         nscoord min = position->mMinHeight.GetCoordValue();
-        if (min && (!heightSet || min > aSize.height)) {
+        if (min && (!heightSet || (min > aSize.height && canOverride))) {
            aSize.height = min;
            heightSet = PR_TRUE;
         }