My previous fix apparently only worked with GCC 7. Having that return at the
end doesn't seem to hurt anything on Windows, so I see no reason to ifdef it.
I don't remember where I heard this, but I vaguely remember hearing that
ending a function without a return statement may be undefined behavior that
differs between compilers and operating systems. If so, that would explain why
this has behaved so differently across platforms and compilers.
The issue is that select elements may contain some non-Latin characters that
need extra block-size to display than the one line-height calculated by using a
Latin font spec in the style.
Before this patch, when a control has an unconstrained block-size, we set
the element's block-size to one line-height in Reflow(), which is intended to
properly initialize `BlockReflowInput::mMinLineHeight` since it uses
`line-height:-moz-block-height`.
However, this simply prevents the display from choosing a larger block-size
after the reflow occurs. Previously, this discrepancy was absorbed by the extra
padding present to make select elements the same intrinsic size as buttons, but
since we did away with that, we're losing the extra space and the font glyphs
get clipped.
This patch fixes the issue by carrying the computed line height over to the
element's display so that its computed block-size is still unconstrained.
This way it can accommodate taller characters in the display text.
After this patch, a <select><option> containing non-Latin characters should have
the same block-size as <button>, and no characters should be clipped.
To better distinguish the calculation of line height (still present with args)
and simply getting the line height without args, it's now called GetLineHeight()
This also introduces `mLineHeight` to cache specifically calculated line heights
that aren't "auto" (which is a magic value), and it opens up the possibility to
override it in Part 7.
This is just a clean port of 1322191 and follow-up 1325970. It really seems to add create a new way to access existing code relating to block formatting and floating elements rather than implementing new functionality, and it is mercifully straightforwards.
Moonchild
Jeremy Andrews
Matt A. Tobin
win7-7
janekptacijarabaci
Matt A. Tobin