Clean up test/.gitignore

- remove no longer used filenames
- reorder to separate generated files from executables
- add comment on how to create list of generated files

test/.gitignore

@@ -12,8 +12,7 @@ fltk*.exp
 fltk*.lib
 *.ilk
 
-# Linux/Unix/macOS executables,
-# fluid generated source files and headers etc.
+# Linux/Unix/macOS executables
 
 adjuster
 animated
@@ -27,8 +26,6 @@ button
 buttons
 cairo_test
 checkers
-checkers_pieces.cxx
-checkers_pieces.h
 clipboard
 clock
 colbrowser
@@ -36,8 +33,6 @@ color_chooser
 coordinates
 cube
 CubeView
-CubeViewUI.cxx
-CubeViewUI.h
 cursor
 curve
 demo
@@ -45,8 +40,6 @@ device
 doublebuffer
 editor
 fast_slow
-fast_slow.cxx
-fast_slow.h
 file_chooser
 fltk-versions
 fonts
@@ -62,19 +55,13 @@ icon
 iconize
 image
 inactive
-inactive.cxx
-inactive.h
 input
 input_choice
 keyboard
-keyboard_ui.cxx
-keyboard_ui.h
 label
 line_style
 list_visuals
 mandelbrot
-mandelbrot_ui.cxx
-mandelbrot_ui.h
 menubar
 message
 minimum
@@ -87,16 +74,9 @@ pack
 pixmap
 pixmap_browser
 preferences
-preferences.cxx
-preferences.h
-print
 radio
-radio.cxx
-radio.h
 resize
 resizebox
-resize.cxx
-resize.h
 resize-example1
 resize-example2
 resize-example3a
@@ -111,31 +91,50 @@ resize-example5c
 rotated_text
 scroll
 shape
-shiny
-shiny_panel.cxx
-shiny_panel.h
 subwindow
 sudoku
 symbols
 table
 tabs
-tabs.cxx
-tabs.h
 threads
 tile
 tiled_image
 tree
-tree.cxx
-tree.h
 twowin
 unittests
 utf8
 valuators
-valuators.cxx
-valuators.h
 windowfocus
 wizard
 
 # macOS binary files
 
 *.app
+
+# fluid generated source files and headers, generated using bash:
+# > for f in *.fl;do b=`basename $f .fl`;echo $b.cxx;echo $b.h;done
+
+CubeViewUI.cxx
+CubeViewUI.h
+checkers_pieces.cxx
+checkers_pieces.h
+fast_slow.cxx
+fast_slow.h
+inactive.cxx
+inactive.h
+keyboard_ui.cxx
+keyboard_ui.h
+mandelbrot_ui.cxx
+mandelbrot_ui.h
+preferences.cxx
+preferences.h
+radio.cxx
+radio.h
+resize.cxx
+resize.h
+tabs.cxx
+tabs.h
+tree.cxx
+tree.h
+valuators.cxx
+valuators.h