For a very simple test program see STR 3222, File 2:
https://www.fltk.org/strfiles/3222/value_slider.cxx
Known issues:
- range checking of the value box size is very limited
- resizing the widget does not change the value box size
- drawing issues are possible if the value box size and the widget
size are not compatible (e.g. value box too large)
This was necessary because the latest GitHub "runner" image (20221120.1)
includes incompatible image libs (libjpeg, libpng, and zlib). This
caused `fluid-cmd.exe` to fail with error code -1073741511. For further
information please refer to this GitHub Issue:
https://github.com/actions/runner-images/issues/6627
The previous runner version (20221027.1) did not include these libs
and our build used the internal libs and worked.
The fix is to disable the search for system libs in CMake.
Note: this does not explain *why* these libs are incompatible.
Fl_Flex would not change type when it had no children.
Function evaluation could read past string end.
Fl_Window_Type would not initialise all member variables.
Use the new standard arrow drawing methods (whose style depends on
the active scheme) for "arrows" used in Fl_Menu and Fl_Menu_Button.
To do: maybe we need some "fine tuning" of arrow sizes in some of
the modified widgets using the new "arrow drawing" methods.
1) We don't need to build the libdecor demo programs for FLTK.
2) The Wayland build process generates some source and header files
in the main src/ directory. These files are now ignored by git.
The problem was that after a drag-n-drop within a window, text selection
by shift+arrow key stopped working.
Also, improves drag-n-drop within a window by leaving insertion point
at end of dragged text.
This removes the cause of this developer's message
# FIXME: This needs to be redesigned! Forcing GTK_FOUND to 0 (NO) is a bad
# FIXME: idea because there could be unwanted side effects. AlbrechtS
"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
Selecting a text range programmatically would not sync
some variables with the actual selection. This also fixes
a crash bug in macOS when dragging text that was
selected by buffer()->select() only.
