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[tor-commits] [Git][tpo/applications/mullvad-browser][mullvad-browser-115.10.0esr-13.5-1] Bug 42528: Don't leak system scrollbar size on windows.

Title: GitLab

Pier Angelo Vendrame pushed to branch mullvad-browser-115.10.0esr-13.5-1 at The Tor Project / Applications / Mullvad Browser

Commits:

  • 1908311e
    by Henry Wilkes at 2024-04-17T18:10:56+02:00 
    Bug 42528: Don't leak system scrollbar size on windows.

2 changed files:

Changes:

  • widget/ScrollbarDrawingWin.cpp
    ... ... @@ -11,6 +11,7 @@
    11 11 
     #include "nsLayoutUtils.h"
    12 12 
     #include "Theme.h"
    13 13 
     #include "nsNativeTheme.h"
    14 
    +#include "nsContentUtils.h"
    14 15
    15 16 
     namespace mozilla::widget {
    16 17
    ... ... @@ -164,7 +165,10 @@ void ScrollbarDrawingWin::RecomputeScrollbarParams() {
    164 165 
       }
    165 166 
       ConfigureScrollbarSize(defaultSize);
    166 167
    167 
    -  if (StaticPrefs::widget_non_native_theme_win_scrollbar_use_system_size()) {
    168 
    +  // Do not leak system size when using ResistFingerprinting.
    169 
    +  if (!nsContentUtils::ShouldResistFingerprinting("No context available",
    170 
    +                                                  RFPTarget::Unknown) &&
    171 
    +      StaticPrefs::widget_non_native_theme_win_scrollbar_use_system_size()) {
    168 172 
         ConfigureScrollbarSize(LookAndFeel::GetInt(
    169 173 
             LookAndFeel::IntID::SystemScrollbarSize, defaultSize));
    170 174 
       }

  • widget/ScrollbarDrawingWin11.cpp
    ... ... @@ -11,6 +11,7 @@
    11 11 
     #include "nsLayoutUtils.h"
    12 12 
     #include "Theme.h"
    13 13 
     #include "nsNativeTheme.h"
    14 
    +#include "nsContentUtils.h"
    14 15
    15 16 
     using mozilla::gfx::sRGBColor;
    16 17
    ... ... @@ -352,6 +353,11 @@ bool ScrollbarDrawingWin11::PaintScrollbarThumb(
    352 353
    353 354 
     void ScrollbarDrawingWin11::RecomputeScrollbarParams() {
    354 355 
       ScrollbarDrawingWin::RecomputeScrollbarParams();
    356 
    +  if (nsContentUtils::ShouldResistFingerprinting("No context available",
    357 
    +                                                 RFPTarget::Unknown)) {
    358 
    +    // Do not distinguish sizes between windows 10 and 11.
    359 
    +    return;
    360 
    +  }
    355 361 
       // TODO(emilio): Maybe make this configurable? Though this doesn't respect
    356 362 
       // classic Windows registry settings, and cocoa overlay scrollbars also don't
    357 363 
       // respect the override it seems, so this should be fine.

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