fix_properly_honor_printing_page_ranges.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shelley Vohr <shelley.vohr@gmail.com>
Date: Thu, 20 Aug 2020 10:55:48 -0700
Subject: fix: properly honor printing page ranges

The print ranges in Chromium's print job settings were not being properly
plumbed through to PMPrintSettings on mcOS. This fixes that by setting
them should they exist.

This will be upstreamed.

diff --git a/printing/printing_context_mac.h b/printing/printing_context_mac.h
index 06cdc0e1a4a50e29a148c97c964c30a939e800da..5db5cdb61be0beee4506313dcde46c499e011383 100644
--- a/printing/printing_context_mac.h
+++ b/printing/printing_context_mac.h
@@ -81,6 +81,10 @@ class PRINTING_EXPORT PrintingContextMac : public PrintingContext {
   // Returns true if the orientation was set.
   bool SetOrientationIsLandscape(bool landscape);
 
+  // Set the page range in native print info object.
+  // Returns true if the range was set.
+  bool SetPrintRangeInPrintSettings(const PageRanges& ranges);
+
   // Sets duplex mode in PMPrintSettings.
   // Returns true if duplex mode is set.
   bool SetDuplexModeInPrintSettings(mojom::DuplexMode mode);
diff --git a/printing/printing_context_mac.mm b/printing/printing_context_mac.mm
index 56bcfbe625537c7b1bc2a999c261836bb15896ba..849e35a5a862921fafc1580496063f4bd1aa0fb5 100644
--- a/printing/printing_context_mac.mm
+++ b/printing/printing_context_mac.mm
@@ -188,7 +188,8 @@ PMPaper MatchPaper(CFArrayRef paper_list,
         !SetCopiesInPrintSettings(settings_->copies()) ||
         !SetCollateInPrintSettings(settings_->collate()) ||
         !SetDuplexModeInPrintSettings(settings_->duplex_mode()) ||
-        !SetOutputColor(settings_->color())) {
+        !SetOutputColor(settings_->color()) ||
+        !SetPrintRangeInPrintSettings(settings_->ranges()) ) {
       return OnError();
     }
   }
@@ -341,6 +342,22 @@ PMPaper MatchPaper(CFArrayRef paper_list,
   return PMSetCopies(print_settings, copies, false) == noErr;
 }
 
+bool PrintingContextMac::SetPrintRangeInPrintSettings(const PageRanges& ranges) {
+  // Default is already NSPrintAllPages - we can safely bail.
+  if (ranges.empty())
+    return true; 
+
+  auto* print_settings =
+      static_cast<PMPrintSettings>([print_info_.get() PMPrintSettings]);
+
+  // macOS does not allow multiple ranges, so pluck the first.
+  auto range = ranges.front();
+  bool set_first_page = PMSetFirstPage(print_settings, range.from + 1, false) == noErr;
+  bool set_last_page = PMSetLastPage(print_settings, range.to + 1, false) == noErr;
+
+  return set_first_page && set_last_page;
+}
+
 bool PrintingContextMac::SetCollateInPrintSettings(bool collate) {
   PMPrintSettings print_settings =
       static_cast<PMPrintSettings>([print_info_.get() PMPrintSettings]);
diff --git a/printing/printing_context_system_dialog_win.cc b/printing/printing_context_system_dialog_win.cc
index d3c8677f30d72efc49b28f293260c74c7b8d8b4e..73744c03eae91687a9229ebc2249a55fdf30e4bb 100644
--- a/printing/printing_context_system_dialog_win.cc
+++ b/printing/printing_context_system_dialog_win.cc
@@ -52,14 +52,25 @@ void PrintingContextSystemDialogWin::AskUserForSettings(
   PRINTPAGERANGE ranges[32];
   dialog_options.nStartPage = START_PAGE_GENERAL;
   if (max_pages) {
-    // Default initialize to print all the pages.
     memset(ranges, 0, sizeof(ranges));
-    ranges[0].nFromPage = 1;
-    ranges[0].nToPage = max_pages;
-    dialog_options.nPageRanges = 1;
-    dialog_options.nMaxPageRanges = base::size(ranges);
+
+    auto page_ranges = settings_->ranges();
+    if (!page_ranges.empty()) {
+      for (size_t i = 0; i < page_ranges.size(); i++) {
+        auto range = page_ranges[i];
+        ranges[i].nFromPage = range.from;
+        ranges[i].nToPage = range.to;
+      }
+      dialog_options.nPageRanges = page_ranges.size();
+    } else {
+      ranges[0].nFromPage = 1;
+      ranges[0].nToPage = max_pages;
+      dialog_options.nPageRanges = 1;
+    }
+
     dialog_options.nMinPage = 1;
     dialog_options.nMaxPage = max_pages;
+    dialog_options.nMaxPageRanges = base::size(ranges);
     dialog_options.lpPageRanges = ranges;
   } else {
     // No need to bother, we don't know how many pages are available.
diff --git a/ui/gtk/printing/print_dialog_gtk.cc b/ui/gtk/printing/print_dialog_gtk.cc
index 8a78a609295a1d90208bdc7e73d7a850c319f361..8efbbfb31eac99323be5e81826d5738b2390a82d 100644
--- a/ui/gtk/printing/print_dialog_gtk.cc
+++ b/ui/gtk/printing/print_dialog_gtk.cc
@@ -239,6 +239,22 @@ void PrintDialogGtk::UpdateSettings(
 
   gtk_print_settings_set_n_copies(gtk_settings_, settings->copies());
   gtk_print_settings_set_collate(gtk_settings_, settings->collate());
+  
+  auto print_ranges = settings->ranges();
+  if (!print_ranges.empty()) {
+    // Tell the system that we only intend to print a subset of pages.
+    gtk_print_settings_set_print_pages(gtk_settings_, GTK_PRINT_PAGES_RANGES);
+
+    GtkPageRange* ranges;
+    ranges = g_new (GtkPageRange, print_ranges.size());
+    for (size_t i = 0; i < print_ranges.size(); i++) {
+      auto range = print_ranges[i];
+      ranges[i].start = range.from;
+      ranges[i].end = range.to;
+    }
+
+    gtk_print_settings_set_page_ranges(gtk_settings_, ranges, 1);
+  }
 
 #if defined(USE_CUPS)
   // Set advanced settings first so they can be overridden by user applied