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After comparison with older versions I realized that the gtk+ specific
"chevron style" was previously used *exclusively* in Fl_Scrollbar.
Unfortunately I had picked this style as template for all arrows.
GitHub Issue #1117 requested to add an option for users to change the
arrow style but after my investigation I decided to use the "old style"
(triangles) for all schemes (except "oxy" that has its own drawing
methods).
**IF** it turned out that we need the gtk specific drawing for scrollbars
we could easily reactivate the "chevron style" by adding yet another
arrow type - but I hope this is not necessary.
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src/fl_draw.cxx: improve documentation, add \since 1.4.0,
simplify scaling code, use forgotten 'color' argument to set the
circle color.
src/fl_draw_arrow.cxx: add doxygen \since statement
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This commit is similar to the patch given in STR 3477, oxy_v5.diff:
https://www.fltk.org/strfiles/3477/oxy_v5.diff
... with modifications, and updated to current FLTK code.
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Make sure we don't change the current color after we finish drawing.
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"Arrows" in widgets are those GUI elements mostly represented by
triangles pointing in a particular direction as in scrollbars,
choice widgets, some menus, valuators and Fl_Counter widgets.
The code has been simplified and standardized such that all these
GUI elements are drawn identically per FLTK scheme.
Widget authors no longer need to write code to calculate arrow sizes
and draw polygons etc.
Different schemes can and do implement different drawing functions.
Todo: see comments "FIXME_ARROW" in src/Fl_Menu_Button.cxx and
src/Fl_Menu.cxx
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