gui_toolkit 0.78.0

Added

• Dock_Options.strip_last: boxes after a stack's fold and menu buttons, the strip's last control (a window's close button stays at the far right; strip_end comes before them).
• ui.field_num_step: the number at the caret of a focused field stepped as browsers' style editors step it: Up / Down 1, Page Up / Page Down 10, Shift 10, Alt 0.1, Ctrl 100, and the wheel over the field with the same modifiers; its unit and the text around it stay (margin: 10px 5px, rgba(10, 20, 30, 0.5), calc(100% - 12px)), a number inside a word or a hex colour is none, the number stepped is selected and the step is an edit of the field's history. ui.num_step_text and ui.num_step_delta do it on a string and a key press.
• ui.color_picker: a colour picker for a ui.Color_Pick the app owns (color_pick_set, color_pick_rgba, color_pick_text, color_pick_destroy; color_picker_width): a saturation / value square, a hue bar and an opacity bar beside the colour it was opened with (a click takes it back) and the new one, a switch of the text's format (hex, rgb, hsl, oklch) and the colour as text, applied as it is typed. Every part is a Tab stop, moved by the arrows (Shift: a tenth; the hue by degrees), and screen readers see sliders, a radio group and a field. No eyedropper: the platform layer reads no pixel of the screen.
  • ui.color_parse / ui.color_text: hex, rgb() / rgba(), hsl() / hsla() and oklch() read and written, in the style they were written in (Color_Style: the format, the legacy comma syntax or the short hex); srgb_to_hsv, hsv_to_srgb, srgb_to_hsl, hsl_to_srgb, srgb_to_oklch, oklch_to_srgb.
  • ui.alpha_picker, ui.checker_draw; hue_picker takes horizontal; sat_val_picker, hue_picker and alpha_picker take the keyboard and tell screen readers their values.