We fake the alpha channel by pre-multiplying but we forgot to account
for the downscaling of the input channel value in addition to correcting
the alpha * white. This led to clipping when the values overflowed
Fixes https://gitlab.com/kicad/code/kicad/issues/14238
Old PLOTTER::Text is not (yet) removed, but it use negative text size
to mirrored text, which is not really compatible with some plotters (especially PDF).
Using TEXT_ATTRIBUTES is much easy and much better,
so PLOTTER::PlotText() is added.
Note: "old" PLOTTER::Text() is not removed yet.
Rather than hiding a single line at once, we align each word in the
string with the approximate location of the output word. This allows
better selecting text in the output pdf
Fixes https://gitlab.com/kicad/code/kicad/issues/12159
(Not sure if it solves the MSW issues yet, but at least it highlights
the items in the dropdown on rollover on OSX.)
Also added some text to the dropdown menu for intersheet references in
the PDF.
Also moves most navigation code to SCH_NAVIGATION_TOOL.
Also changes page number href to anchor syntax ('#foo').
Also adds hypertext processing to SCH_TEXTBOXes.
Also adds combobox with schematic pages to text properties dialog.
The problem is that "real" page numbers can be duplicated, so we work around it
by using virtual page numbers instead which are guaranteed unique.
Example "goto:3" will go to page 3. If customised page numbers are used such as
a, b, c, then to go to page b, we should specify goto:2 (i.e. the virtual page
number).
Only SVG can actually handle transparency, but we should at least mimic
the color value of other transparent fills by blending with a (presumed)
white paper.
Fixes https://gitlab.com/kicad/code/kicad/issues/11304
Also fixes some plot bugs with arcs.
Also moves polygonization of arcs (when required) in plotting code
from 5 degrees to calculated based on ARC_HIGH_DEF.
Fixes https://gitlab.com/kicad/code/kicad/issues/5017
Unused variables in function calls can be commented out. Unused
return variables get a new routine `ignore_unused()` that silences the
warnings with zero overhead.
