Bug 1660986 - Handle print in color setting on Windows. r=bobowen

Differential Revision: https://phabricator.services.mozilla.com/D88128

widget/windows/nsPrintSettingsWin.cpp

@@ -206,6 +206,10 @@ void nsPrintSettingsWin::InitWithInitializer(
     SetPrintInColor(devmode->dmColor == DMCOLOR_COLOR);
   }
 
+  if (devmode->dmFields & DM_COLOR) {
+    SetPrintInColor(devmode->dmColor == DMCOLOR_COLOR);
+  }
+
   // Set the paper sizes to match the unit.
   double pointsToSizeUnit =
       mPaperSizeUnit == kPaperSizeInches ? 1.0 / 72.0 : 25.4 / 72.0;
@@ -394,6 +398,10 @@ void nsPrintSettingsWin::CopyFromNative(HDC aHdc, DEVMODEW* aDevMode) {
     mPrintInColor = aDevMode->dmColor == DMCOLOR_COLOR;
   }
 
+  if (aDevMode->dmFields & DM_COLOR) {
+    mPrintInColor = aDevMode->dmColor == DMCOLOR_COLOR;
+  }
+
   InitUnwriteableMargin(aHdc);
 
   // The length and width in DEVMODE are always in tenths of a millimeter.
@@ -445,6 +453,9 @@ void nsPrintSettingsWin::CopyToNative(DEVMODEW* aDevMode) {
   aDevMode->dmFields |= DM_COLOR;
   aDevMode->dmColor = mPrintInColor ? DMCOLOR_COLOR : DMCOLOR_MONOCHROME;
 
+  aDevMode->dmFields |= DM_COLOR;
+  aDevMode->dmColor = mPrintInColor ? DMCOLOR_COLOR : DMCOLOR_MONOCHROME;
+
   // The length and width in DEVMODE are always in tenths of a millimeter.
   double sizeUnitToTenthsOfAmm =
       10L * (mPaperSizeUnit == kPaperSizeInches ? MM_PER_INCH_FLOAT : 1L);