* Headers/Additions/GNUstepGUI/GSTheme.h: New GSThemeMargins struct.

Rename buttonBorderForCell:style:state: to buttonMarginsForCell:style:state:
and return the top/bottom/left/right margins instead of just two values.
(This is a theme API break.)
* Source/GSThemeDrawing.m: Implement buttonMarginsForCell:style:state:.
Also reduce the top and left margin of the default button by 1 pt, to
better reflect the button's appearance.
* Source/GSGuiPrivate.h: Add a GSRoundTowardsNegativeInfinity function
* Source/NSButtonCell.m (-drawImage:withFrame:inView:): Round the image
position down and to the right, as this seems to look the best.
* Source/NSButtonCell.m (-cellSize): Call new buttonMarginsForCell: method
* Source/NSButtonCell.m (-drawingRectForBounds:): Call new
buttonMarginsForCell: method


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@33743 72102866-910b-0410-8b05-ffd578937521

Headers/Additions/GNUstepGUI/GSTheme.h

@@ -287,7 +287,17 @@ APPKIT_EXPORT  NSString        *GSProgressIndicatorBarDeterminate;
  */
 APPKIT_EXPORT  NSString        *GSColorWell;
 
-
+/**
+ * Structure to describe the size of top/bottom/left/right margins inside
+ * a button
+ */
+typedef struct GSThemeMargins
+{
+  CGFloat left;
+  CGFloat right;
+  CGFloat top;
+  CGFloat bottom;
+} GSThemeMargins;
 
 /**
  * This defines how the values in a tile array should be used when
@@ -732,9 +742,9 @@ APPKIT_EXPORT	NSString	*GSThemeWillDeactivateNotification;
 /**
  * Amount by which the button is inset by the border.
  */
-- (NSSize) buttonBorderForCell: (NSCell*)cell
-			 style: (int)style 
-                         state: (GSThemeControlState)state;
+- (GSThemeMargins) buttonMarginsForCell: (NSCell*)cell
+				  style: (int)style 
+				  state: (GSThemeControlState)state;
 
 /** 
  * Draws the indicator (normally a dotted rectangle) to show that