From 8f99c084feab058a0693df3df3d3d03b354a2d03 Mon Sep 17 00:00:00 2001
From: attila <attila@juce.com>
Date: Tue, 17 May 2022 15:42:39 +0200
Subject: [PATCH] Linux:  Adjust natively reported border size by the current
 scale factor

---
 modules/juce_graphics/geometry/juce_BorderSize.h       | 10 ++++++++++
 .../juce_gui_basics/native/juce_linux_Windowing.cpp    |  8 +++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/modules/juce_graphics/geometry/juce_BorderSize.h b/modules/juce_graphics/geometry/juce_BorderSize.h
index 7510cb35cd..681fc4e86a 100644
--- a/modules/juce_graphics/geometry/juce_BorderSize.h
+++ b/modules/juce_graphics/geometry/juce_BorderSize.h
@@ -145,6 +145,16 @@ public:
                  other.right  + right };
     }
 
+    /** Multiplies each member of the border by a scalar. */
+    template <typename ScalarType>
+    BorderSize<ValueType> multipliedBy (ScalarType scalar) const noexcept
+    {
+        return { static_cast<ValueType> (scalar * top),
+                 static_cast<ValueType> (scalar * left),
+                 static_cast<ValueType> (scalar * bottom),
+                 static_cast<ValueType> (scalar * right) };
+    }
+
     //==============================================================================
     bool operator== (const BorderSize& other) const noexcept { return tie() == other.tie(); }
     bool operator!= (const BorderSize& other) const noexcept { return tie() != other.tie(); }
diff --git a/modules/juce_gui_basics/native/juce_linux_Windowing.cpp b/modules/juce_gui_basics/native/juce_linux_Windowing.cpp
index 7f4c185d48..0f49dce757 100644
--- a/modules/juce_gui_basics/native/juce_linux_Windowing.cpp
+++ b/modules/juce_gui_basics/native/juce_linux_Windowing.cpp
@@ -377,7 +377,13 @@ public:
         else if (! windowBorder
                  || ((*windowBorder).getTopAndBottom() == 0 && (*windowBorder).getLeftAndRight() == 0))
         {
-            windowBorder = XWindowSystem::getInstance()->getBorderSize (windowH);
+            windowBorder = [&]()
+            {
+                if (auto unscaledBorderSize = XWindowSystem::getInstance()->getBorderSize (windowH))
+                    return OptionalBorderSize { (*unscaledBorderSize).multipliedBy (1.0 / currentScaleFactor) };
+
+                return OptionalBorderSize {};
+            }();
         }
     }