Reorganize content of CHANGES.txt & introduce Fl_Flex

CHANGES.txt

@@ -14,11 +14,39 @@ Changes in FLTK 1.4.0                            Released: ??? ?? 2022
   - autoconf/configure is still supported by the FLTK team for backwards
     compatibility with older systems that lack CMake support.
 
+  - FLTK 1.4 introduces a new platform, Wayland, available for recent Linux
+    distributions and FreeBSD. More information in README.Wayland.txt
 
   New Features and Extensions
 
-  - FLTK 1.4 introduces a new platform, Wayland, available for recent Linux
-    distributions. More information in README.Wayland.txt
+  - X11 and Wayland platforms: Added support for HiDPI displays and for rescaling any window
+    at run-time under user control. Under the gnome desktop, FLTK applications
+    detect the current gnome scaling factor and use it to scale all FLTK windows.
+    Under other desktops, the FLTK_SCALING_FACTOR environment variable can be
+    used to set the starting scaling factor of all FLTK applications.
+    In addition, it is possible to rescale all FLTK windows mapped to a screen
+    by typing ctrl-'+' (enlarge), ctrl-'-' (shrink) or ctrl-'0' (back to starting
+    factor value). Windows moved between screens adjust to the scaling factor of
+    their screen. This supports desktops mixing screens with distinct resolutions.
+  - MSWindows platform: Added support for rescaling the GUI of any app
+    at run-time using the ctrl/+/-/0/ keystrokes. All applications
+    detect the desktop scaling factor and automatically scale their GUI
+    accordingly. This effectively renders WIN32 FLTK apps "per-monitor DPI-aware"
+    whereas they were "DPI-unaware" with FLTK 1.3.x.
+  - macOS platform: Added support for rescaling the GUI of any app at run-time
+    using the command/+/-/0/ keystrokes.
+  - New Fl_Flex class to layout one row or one column of widgets.
+  - New Fl::keyboard_screen_scaling(0) call stops recognition of ctrl/+/-/0/
+    keystrokes as scaling all windows of a screen.
+  - New member function Fl_Image::scale(int width, int height) to set
+    the drawing size of an image independently from its data size. The
+    same function was previously available only for class Fl_Shared_Image
+    and with FL_ABI_VERSION >= 10304. New member functions Fl_Image::data_w()
+    and Fl_Image::data_h() give the width and height of the image data.
+  - New Fl_SVG_Image class: gives support of scalable vector graphics images
+    to FLTK using the nanosvg software.
+  - New classes Fl_SVG_File_Surface and Fl_EPS_File_Surface to save any FLTK
+    graphics to SVG or EPS files, respectively.
   - Windows platform: added support for using a manifest to set the
     application's level of DPI awareness (issue #309).
   - X11 platform: class Fl_Native_File_Chooser will run the KDE file dialog
@@ -39,11 +67,7 @@ Changes in FLTK 1.4.0                            Released: ??? ?? 2022
   - The border radius of "rounded" box types can be limited and
     the shadow width of "shadow" box types can be configured (issue #130).
     See Fl::box_border_radius_max() and Fl::box_shadow_width().
-  - New classes Fl_SVG_File_Surface and Fl_EPS_File_Surface to save any FLTK
-    graphics to SVG or EPS files, respectively.
   - New fl_putenv() is a cross-platform putenv() wrapper (see docs).
-  - New Fl::keyboard_screen_scaling(0) call stops recognition of ctrl/+/-/0/
-    keystrokes as scaling all windows of a screen.
   - New "Preview" switch added to the GTK native file chooser dialog
     available on the X11 platform. This requires function fl_register_images()
     to have been called.
@@ -57,11 +81,6 @@ Changes in FLTK 1.4.0                            Released: ??? ?? 2022
   - New member functions Fl_Paged_Device::begin_job() and begin_page()
     replace start_job() and start_page(). The start_... names are maintained
     for API compatibility.
-  - New member function Fl_Image::scale(int width, int height) to set
-    the drawing size of an image independently from its data size. The
-    same function was previously available only for class Fl_Shared_Image
-    and with FL_ABI_VERSION >= 10304. New member functions Fl_Image::data_w()
-    and Fl_Image::data_h() give the width and height of the image data.
   - OpenGL draws text using textures on all platforms, when the necessary
     hardware support is present (a backup mechanism is available in absence
     of this support). Thus, all text drawable in Fl_Window's can be drawn
@@ -73,13 +92,6 @@ Changes in FLTK 1.4.0                            Released: ??? ?? 2022
     has been changed. With FLTK 1.3.x, the application terminated when all
     windows were closed even before Fl::run() or Fl::wait() could return.
     With FLTK 1.4, Fl::run() returns so the app follows its normal termination path.
-  - MacOS platform: Added support for rescaling the GUI of any app at run-time
-    using the command/+/-/0/ keystrokes.
-  - MSWindows platform: Added support for rescaling the GUI of any app
-    at run-time using the ctrl/+/-/0/ keystrokes. All applications
-    detect the desktop scaling factor and automatically scale their GUI
-    accordingly. This effectively renders WIN32 FLTK apps "per-monitor DPI-aware"
-    whereas they were "DPI-unaware" with FLTK 1.3.x.
   - FLTK apps on the MacOS platform contain automatically a Window menu, which,
     under MacOS ≥ 10.12, allows to group/ungroup windows in tabbed form. The new
     Fl_Sys_Menu_Bar::window_menu_style() function allows to specify various
@@ -87,26 +99,14 @@ Changes in FLTK 1.4.0                            Released: ??? ?? 2022
   - New function: int fl_open_ext(const char* fname, int binary, int oflags, ...)
     to control the opening of files in binary/text mode in a cross-platform way.
   - Fix for issue #247 : loading SVG image with BOM.
-  - New Fl_SVG_Image class: gives support of scalable vector graphics images
-    to FLTK using the nanosvg software.
   - Fl_Text_Selection got a new method length() and returns 0 in length()
     and in all offsets (start(), end(), position()) if no text is selected
     (selected() == false). The behavior in FLTK 1.3 and earlier versions
     (returning undefined values if !selected()) was confusing.
-  - Added support for MacOS 10.13 "High Sierra".
   - New method Fl_Group::bounds() replaces Fl_Group::sizes() which is now
     deprecated. Fl_Group::bounds() uses the new class Fl_Rect that contains
     widget coordinates and sizes x(), y(), w(), and h() (STR #3385).
     Documentation for bounds() and its internal structure was added.
-  - X11 platform: Added support for HiDPI displays and for rescaling any window
-    at run-time under user control. Under the gnome desktop, FLTK applications
-    detect the current gnome scaling factor and use it to scale all FLTK windows.
-    Under other desktops, the FLTK_SCALING_FACTOR environment variable can be
-    used to set the starting scaling factor of all FLTK applications.
-    In addition, it is possible to rescale all FLTK windows mapped to a screen
-    by typing ctrl-'+' (enlarge), ctrl-'-' (shrink) or ctrl-'0' (back to starting
-    factor value). Windows moved between screens adjust to the scaling factor of
-    their screen. This supports desktops mixing screens with distinct resolutions.
   - New method shadow(int) allows to disable the shadows of the hands
     of Fl_Clock, Fl_Clock_Output, and derived widgets.
   - New method Fl_Tabs::tab_align() allows to set alignment of tab labels,
@@ -114,18 +114,18 @@ Changes in FLTK 1.4.0                            Released: ??? ?? 2022
   - Added Fl_Surface_Device::push_current(new_surface) and
     Fl_Surface_Device::pop_current() to set/unset the current surface
     receiving graphics commands.
+
+  New Configuration Options (ABI Version)
+
   - X11 platform: Added support for drawing text with the pango library
     which allows to draw most scripts supported by Unicode, including CJK
     and right-to-left scripts. FLTK now outputs PostScript that draws
     those scripts in vectorial form. The corresponding CMake option is
     OPTION_USE_PANGO. The corresponding configure option is --enable-pango.
     This option is OFF by default.
-
-  New Configuration Options (ABI Version)
-
   - Configure option --enable-wayland allows to build the FLTK library for
     the new Wayland platform while remaining compatible with X11. The
-    corresponding CMake option is OPTION_USE_WAYLAND.
+    corresponding CMake option is OPTION_USE_WAYLAND. This option is OFF by default.
   - Configure options --enable-wayland --disable-x11 used together allow to
     build FLTK for the Wayland backend only (no x11 backend). Under CMake, the
     equivalent is to set both OPTION_USE_WAYLAND and OPTION_WAYLAND_ONLY.
@@ -156,13 +156,17 @@ Changes in FLTK 1.4.0                            Released: ??? ?? 2022
 
   - (add new items here)
   - Added support for macOS 13.0 "Ventura".
-  - Fixed X11 Input Method window badly positioned with Fl_Text_Editor
-    widget (issue #270).
   - Added support for macOS 12.0 "Monterey".
-  - Fixed X11 copy-paste and drag-and-drop target selection (issue #182).
-    This fix has been backported to 1.3.6 as well.
   - Added support for macOS 11.0 "Big Sur" and for building for
     the arm64 architecture.
+  - Added support for macOS 10.15 "Catalina"
+  - Added support for macOS 10.14 "Mojave": all drawing to windows is done
+    through "layer-backed views" when the app is linked to SDK 10.14.
+  - Added support for macOS 10.13 "High Sierra".
+  - Fixed X11 Input Method window badly positioned with Fl_Text_Editor
+    widget (issue #270).
+  - Fixed X11 copy-paste and drag-and-drop target selection (issue #182).
+    This fix has been backported to 1.3.6 as well.
   - Add optional argument to Fl_Printer::begin_job() to receive
     a string describing the error when an error occurs.
   - Fix Windows-specific bug when the program tries to enlarge a
@@ -175,7 +179,6 @@ Changes in FLTK 1.4.0                            Released: ??? ?? 2022
     of GTK version 3 when available on the running X11 platform, and falls back
     to version 2 when V3 is not available. In contrast, GTK version 2 was used
     in priority by FLTK 1.3.x
-  - Added support for macOS 10.15 "Catalina"
   - Improved documentation for '@' symbols in labels (STR #2940).
   - Fl_Roller can now be controlled via the mouse wheel (STR #3120).
   - Tooltips hide by themselves after 12 seconds (STR #2584).
@@ -184,8 +187,6 @@ Changes in FLTK 1.4.0                            Released: ??? ?? 2022
   - Fix for STR#3473 (and its duplicate STR#3507) to restore configure-based
     builds on recent Linux/Unix distributions where the freetype-config
     command has been replaced by pkg-config.
-  - Added support for MacOS 10.14 "Mojave": all drawing to windows is done
-    through "layer-backed views" when the app is linked to SDK 10.14.
   - MacOS ≥ 10.10: Fl_Window::fullscreen() and fullscreen_off() no longer
     proceed by Fl_Window::hide() + Fl_Window::show() but essentially
     resize the window, as done on the X11+EWMH and Windows platforms.