Improve size grip appearance

files/windows/QWindowsVistaDark/dark.qrc

@@ -22,6 +22,7 @@
 		<file>scrollbar-arrow-left.svg</file>
 		<file>scrollbar-arrow-right.svg</file>
 		<file>scrollbar-arrow-up.svg</file>
+		<file>size-grip.svg</file>
 		<file>table-header-sort-arrow-down.svg</file>
 		<file>table-header-sort-arrow-up.svg</file>
 		<file>up-triangle.svg</file>

files/windows/QWindowsVistaDark/dark.qss

@@ -156,6 +156,11 @@ QProgressBar::chunk:disabled
     color: #788D9C;
 }
 
+QSizeGrip
+{
+    image: url(:/dark/size-grip.svg);
+}
+
 QDockWidget
 {
     background-color: #232323;

files/windows/QWindowsVistaDark/size-grip.svg

@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="16"
+   height="16"
+   viewBox="0 0 16 16"
+   version="1.1"
+   id="svg1"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1" />
+  <g
+     id="size-grip"
+     transform="translate(-16,2)">
+    <rect
+       style="fill:#787878;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:0.0466667"
+       id="rect1"
+       width="2"
+       height="2"
+       x="27"
+       y="10" />
+    <use
+       x="0"
+       y="0"
+       xlink:href="#rect1"
+       id="use1"
+       transform="translate(-3)" />
+    <use
+       x="0"
+       y="0"
+       xlink:href="#rect1"
+       id="use2"
+       transform="translate(-6)" />
+    <use
+       x="0"
+       y="0"
+       xlink:href="#rect1"
+       id="use3"
+       transform="translate(0,-3)" />
+    <use
+       x="0"
+       y="0"
+       xlink:href="#rect1"
+       id="use4"
+       transform="translate(-3,-3)" />
+    <use
+       x="0"
+       y="0"
+       xlink:href="#rect1"
+       id="use5"
+       transform="translate(0,-6)" />
+  </g>
+</svg>