XFA - Fix text positions (bug 1718741)

- font line height is taken into account by acrobat when it isn't with masterpdfeditor: I extracted a font from a pdf, modified some ascent/descent properties thanks to ttx and the reinjected the font in the pdf: only Acrobat is taken it into account. So in this patch, line heights for some substituted fonts are added.
  - it seems that Acrobat is using a line height of 1.2 when the line height in the font is not enough (it's the only way I found to fix correctly bug 1718741).
   - don't use flex in wrapper container (which was causing an horizontal overflow in the above bug).
   - consequently, the above fixes introduced a lot of small regressions, so in order to see real improvements on reftests, I fixed the regressions in this patch:
     - replace margin by padding in some case where padding is a part of a container dimensions;
     - remove some flex display: some containers are wrongly sized when rendered;
     - set letter-spacing to 0.01px: it helps to be sure that text is not broken because of not enough width in Firefox.

src/core/segoeui_factors.js

@@ -81,6 +81,7 @@ const SegoeuiBoldFactors = [
   1.02511, 0.99298, 1.07237, 0.96752, 0.96752, 0.96752, 0.96752, 1.03424,
   0.96752, 0.95801, 0.95801, 0.95801, 0.95801, 1.03424, 1.0106,
 ];
+const SegoeuiBoldLineHeight = 1.33008;
 
 // Factors to rescale LiberationSans-BoldItalic.ttf to have the same
 // metrics as segoeuiz.ttf.
@@ -151,6 +152,7 @@ const SegoeuiBoldItalicFactors = [
   0.96752, 0.96752, 1.036, 0.96752, 0.97168, 0.97168, 0.97168, 0.97168, 1.036,
   0.95134,
 ];
+const SegoeuiBoldItalicLineHeight = 1.33008;
 
 // Factors to rescale LiberationSans-Italic.ttf to have the same
 // metrics as segoeuii.ttf.
@@ -221,6 +223,7 @@ const SegoeuiItalicFactors = [
   0.96777, 0.96777, 0.96777, 0.96927, 0.96777, 0.9043, 0.9043, 0.9043, 0.9043,
   0.96927, 0.95364,
 ];
+const SegoeuiItalicLineHeight = 1.33008;
 
 // Factors to rescale LiberationSans-Regular.ttf to have the same
 // metrics as segoeui.ttf.
@@ -291,10 +294,15 @@ const SegoeuiRegularFactors = [
   1.00068, 0.91797, 0.99346, 0.96777, 0.96777, 0.96777, 0.96777, 0.96927,
   0.96777, 0.9043, 0.9043, 0.9043, 0.9043, 0.96927, 1.00221,
 ];
+const SegoeuiRegularLineHeight = 1.33008;
 
 export {
   SegoeuiBoldFactors,
   SegoeuiBoldItalicFactors,
+  SegoeuiBoldItalicLineHeight,
+  SegoeuiBoldLineHeight,
   SegoeuiItalicFactors,
+  SegoeuiItalicLineHeight,
   SegoeuiRegularFactors,
+  SegoeuiRegularLineHeight,
 };