richedit: Fixed rtf reader bug that caused large start indents.

The problem was that the paragraph format was being retrieved,
slightly modified and then used to set the paragraph format, without
limiting the mask to what was being set.  The PFM_OFFSETINDENT mask flag
being valid meant that dxStartIndent specifies a relative offset, thus
dxStartIndent was doubled.

dlls/riched20/editor.c

@@ -472,14 +472,14 @@ static void ME_RTFParAttrHook(RTF_Info *info)
   }
   case rtfFirstIndent:
     ME_GetSelectionParaFormat(info->editor, &fmt);
-    fmt.dwMask |= PFM_STARTINDENT | PFM_OFFSET;
+    fmt.dwMask = PFM_STARTINDENT | PFM_OFFSET;
     fmt.dxStartIndent += info->rtfParam;
     fmt.dxOffset = -info->rtfParam;
     break;
   case rtfLeftIndent:
     /* we assume rtfLeftIndent is always specified before rtfFirstIndent */
     ME_GetSelectionParaFormat(info->editor, &fmt);
-    fmt.dwMask |= PFM_STARTINDENT;
+    fmt.dwMask = PFM_STARTINDENT;
     fmt.dxStartIndent = info->rtfParam;
     fmt.dxOffset = 0;
     break;
@@ -504,11 +504,11 @@ static void ME_RTFParAttrHook(RTF_Info *info)
     ME_GetSelectionParaFormat(info->editor, &fmt);
     if (!(fmt.dwMask & PFM_TABSTOPS))
     {
-      fmt.dwMask |= PFM_TABSTOPS;
       fmt.cTabCount = 0;
     }
     if (fmt.cTabCount < MAX_TAB_STOPS && info->rtfParam < 0x1000000)
       fmt.rgxTabs[fmt.cTabCount++] = info->rtfParam;
+    fmt.dwMask = PFM_TABSTOPS;
     break;
   case rtfKeep:
     fmt.dwMask = PFM_KEEP;
@@ -571,85 +571,92 @@ static void ME_RTFParAttrHook(RTF_Info *info)
     ME_GetSelectionParaFormat(info->editor, &fmt);
     if (!(fmt.dwMask & PFM_BORDER))
     {
-      fmt.dwMask |= PFM_BORDER;
       fmt.wBorderSpace = 0;
       fmt.wBorderWidth = 1;
       fmt.wBorders = 0;
     }
     fmt.wBorders |= 1;
+    fmt.dwMask = PFM_BORDER;
     break;
   case rtfBorderRight:
     ME_GetSelectionParaFormat(info->editor, &fmt);
     if (!(fmt.dwMask & PFM_BORDER))
     {
-      fmt.dwMask |= PFM_BORDER;
       fmt.wBorderSpace = 0;
       fmt.wBorderWidth = 1;
       fmt.wBorders = 0;
     }
     fmt.wBorders |= 2;
+    fmt.dwMask = PFM_BORDER;
     break;
   case rtfBorderTop:
     ME_GetSelectionParaFormat(info->editor, &fmt);
     if (!(fmt.dwMask & PFM_BORDER))
     {
-      fmt.dwMask |= PFM_BORDER;
       fmt.wBorderSpace = 0;
       fmt.wBorderWidth = 1;
       fmt.wBorders = 0;
     }
     fmt.wBorders |= 4;
+    fmt.dwMask = PFM_BORDER;
     break;
   case rtfBorderBottom:
     ME_GetSelectionParaFormat(info->editor, &fmt);
     if (!(fmt.dwMask & PFM_BORDER))
     {
-      fmt.dwMask |= PFM_BORDER;
       fmt.wBorderSpace = 0;
       fmt.wBorderWidth = 1;
       fmt.wBorders = 0;
     }
     fmt.wBorders |= 8;
+    fmt.dwMask = PFM_BORDER;
     break;
   case rtfBorderSingle:
     ME_GetSelectionParaFormat(info->editor, &fmt);
     /* we assume that borders have been created before (RTF spec) */
     fmt.wBorders &= ~0x700;
     fmt.wBorders |= 1 << 8;
+    fmt.dwMask = PFM_BORDER;
     break;
   case rtfBorderThick:
     ME_GetSelectionParaFormat(info->editor, &fmt);
     /* we assume that borders have been created before (RTF spec) */
     fmt.wBorders &= ~0x700;
     fmt.wBorders |= 2 << 8;
+    fmt.dwMask = PFM_BORDER;
     break;
   case rtfBorderShadow:
     ME_GetSelectionParaFormat(info->editor, &fmt);
     /* we assume that borders have been created before (RTF spec) */
     fmt.wBorders &= ~0x700;
     fmt.wBorders |= 10 << 8;
+    fmt.dwMask = PFM_BORDER;
     break;
   case rtfBorderDouble:
     ME_GetSelectionParaFormat(info->editor, &fmt);
     /* we assume that borders have been created before (RTF spec) */
     fmt.wBorders &= ~0x700;
     fmt.wBorders |= 7 << 8;
+    fmt.dwMask = PFM_BORDER;
     break;
   case rtfBorderDot:
     ME_GetSelectionParaFormat(info->editor, &fmt);
     /* we assume that borders have been created before (RTF spec) */
     fmt.wBorders &= ~0x700;
     fmt.wBorders |= 11 << 8;
+    fmt.dwMask = PFM_BORDER;
     break;
   case rtfBorderWidth:
     ME_GetSelectionParaFormat(info->editor, &fmt);
     /* we assume that borders have been created before (RTF spec) */
     fmt.wBorderWidth |= ((info->rtfParam / 15) & 7) << 8;
+    fmt.dwMask = PFM_BORDER;
     break;
   case rtfBorderSpace:
     ME_GetSelectionParaFormat(info->editor, &fmt);
     /* we assume that borders have been created before (RTF spec) */
     fmt.wBorderSpace = info->rtfParam;
+    fmt.dwMask = PFM_BORDER;
     break;
   }  
   if (fmt.dwMask) {