Bug 74696 – sizeof(InlineBox) is 36 instead of 32 on Windows

• Status: NEW
• Component: Layout and Rendering

[Ryosuke Niwa]

Same problem as RenderObject. This one isn't as severe as RenderObject but it's still 12.5% increase in the size :(

Unlike gcc and clang, MSVC pads each consecutive member variables of the same type
in bitfields. e.g. if you have:
sturct AB {
unsigned m_1 : 31;
bool m_2 : 1;
}
then MSVC pads m_1 and allocates sizeof(unsigned) * 2 for AB whereas gcc and clang
only allocate sizeof(unsigned) * 1 for AB.

As a result, RenderObject consumes 44 bytes instead of 32 bytes when compiled on Windows by cl.exe.