Don't do our "enlarge the control a bit to make it look better for small sizes"

thing for fixed-width fonts -- it's unnecessary and just makes it look like
"size" is broken.  Bug 103293, r+sr=rbs

layout/forms/nsTextControlFrame.cpp

@@ -1479,14 +1479,17 @@ nsTextControlFrame::CalculateSizeStandard(nsIPresContext*       aPresContext,
   fontMet->GetAveCharWidth(charWidth);
   fontMet->GetMaxAdvance(charMaxAdvance);
 
-  // calc the min width and pref width. Pref Width is calced by multiplying the size times avecharwidth 
+  // Set the width equal to the width in characters
+  aDesiredSize.width = GetCols() * charWidth;
+
+  // To better match IE, take the maximum character width(in twips) and remove
+  // 4 pixels add this on as additional padding(internalPadding). But only do
+  // this if charMaxAdvance != charWidth; if they are equal, this is almost
+  // certainly a fixed-width font.
+  if (charWidth != charMaxAdvance) {
     float p2t;
     aPresContext->GetPixelsToTwips(&p2t);
-
-  // To better match IE, take the maximum character width(in twips) and remove 4 pixels
-  // add this on as additional padding(internalPadding)
-  nscoord internalPadding = 0;
-  internalPadding = PR_MAX(charMaxAdvance - NSToCoordRound(4 * p2t), 0);
+    nscoord internalPadding = PR_MAX(charMaxAdvance - NSToCoordRound(4 * p2t), 0);
     // round to a multiple of p2t
     nscoord t = NSToCoordRound(p2t); 
     nscoord rest = internalPadding % t; 
@@ -1495,11 +1498,9 @@ nsTextControlFrame::CalculateSizeStandard(nsIPresContext*       aPresContext,
     } else {
       internalPadding += t - rest;
     }
-
-  // Set the width equal to the width in characters
-  aDesiredSize.width = GetCols() * charWidth;
     // Now add the extra padding on (so that small input sizes work well)
     aDesiredSize.width += internalPadding;
+  }
 
   // Set the height equal to total number of rows (times the height of each
   // line, of course)

layout/html/forms/src/nsTextControlFrame.cpp

@@ -1479,14 +1479,17 @@ nsTextControlFrame::CalculateSizeStandard(nsIPresContext*       aPresContext,
   fontMet->GetAveCharWidth(charWidth);
   fontMet->GetMaxAdvance(charMaxAdvance);
 
-  // calc the min width and pref width. Pref Width is calced by multiplying the size times avecharwidth 
+  // Set the width equal to the width in characters
+  aDesiredSize.width = GetCols() * charWidth;
+
+  // To better match IE, take the maximum character width(in twips) and remove
+  // 4 pixels add this on as additional padding(internalPadding). But only do
+  // this if charMaxAdvance != charWidth; if they are equal, this is almost
+  // certainly a fixed-width font.
+  if (charWidth != charMaxAdvance) {
     float p2t;
     aPresContext->GetPixelsToTwips(&p2t);
-
-  // To better match IE, take the maximum character width(in twips) and remove 4 pixels
-  // add this on as additional padding(internalPadding)
-  nscoord internalPadding = 0;
-  internalPadding = PR_MAX(charMaxAdvance - NSToCoordRound(4 * p2t), 0);
+    nscoord internalPadding = PR_MAX(charMaxAdvance - NSToCoordRound(4 * p2t), 0);
     // round to a multiple of p2t
     nscoord t = NSToCoordRound(p2t); 
     nscoord rest = internalPadding % t; 
@@ -1495,11 +1498,9 @@ nsTextControlFrame::CalculateSizeStandard(nsIPresContext*       aPresContext,
     } else {
       internalPadding += t - rest;
     }
-
-  // Set the width equal to the width in characters
-  aDesiredSize.width = GetCols() * charWidth;
     // Now add the extra padding on (so that small input sizes work well)
     aDesiredSize.width += internalPadding;
+  }
 
   // Set the height equal to total number of rows (times the height of each
   // line, of course)