Gfx: Make D2D acknowledge trailing whitespace followed by a NBSP/MMSP

This hacky workaround makes D2D behavior consistent with GDI+.

Library/MeterString.cpp

@@ -387,6 +387,26 @@ bool MeterString::Update()
 			break;
 		}
 
+		// Ugly hack to make D2D render trailing spaces followed by a non-breaking space correctly.
+		// By default, D2D ignores all trailing whitespace. Both GDI+ and D2D, however, acknowledge the
+		// presense of the zero-width space (and give it a width of 0px), so we append the zero-width
+		// space after each non-breaking space.
+		size_t pos = 0;
+		while (true)
+		{
+			const WCHAR spaceChars[] =
+			{
+				L'\u00A0',  // No-Break Space
+				L'\u205F'   // Medium Mathematical Space
+			};
+
+			pos = m_String.find_first_of(spaceChars, pos, _countof(spaceChars));
+			if (pos == std::wstring::npos) break;
+
+			m_String.insert(pos + 1, 1, L'\u200B');
+			pos += 2;
+		}
+
 		if (!m_WDefined || !m_HDefined)
 		{
 			// Calculate the text size