unicode-combine: simplify - remove -Dunicode-precompose option

Since the pre-composing functionality is now part of fcft, it makes
little sense to have a compile time option - there's no size benefit
to be had.

Furthermore, virtually all terminal emulators do
pre-composing (alacritty being an exception), this really isn't that
controversial.

CHANGELOG.md

@@ -22,9 +22,7 @@
 * Right mouse button extends the current selection.
 * `CSI Ps ; Ps ; Ps t` escape sequences for the following parameters:
   `11t`, `13t`, `13;2t`, `14t`, `14;2t`, `15t`, `19t`.
-* Unicode combining characters. Parts of this feature are compile time
-  optional. See [README.md](README.md#user-content-unicode-combining)
-  for details.
+* Unicode combining characters.
 
 ### Changed
 

README.md

@@ -16,7 +16,6 @@ The fast, lightweight and minimalistic Wayland terminal emulator.
 1. [Backspace](#backspace)
 1. [DPI and font size](#dpi-and-font-size)
 1. [Supported OSCs](#supported-oscs)
-1. [Unicode combining](#unicode-combining)
 1. [Requirements](#requirements)
    1. [Running](#running)
    1. [Building](#building)
@@ -269,33 +268,6 @@ with the terminal emulator itself. Foot implements the following OSCs:
 * `OSC 555` - flash screen (**foot specific**)
 
 
-## Unicode combining
-
-When the client prints Unicode combining characters, e.g `a\\u0308`
-('a' + `COMBINING DIAERESIS`), foot will be default try to create a
-pre-composed character. For example, `\\u0061\\u0308` (`a\\u0308`)
-will be transformed into `\\u00e5` (`å`).
-
-This is to improve the looks of the rendered grapheme. When rendering
-a decomposed string, `a\\u0308`, the glyphs for `a` and `\\u0308` are
-rendered independently, on top off each other. The result if often not
-optimal, with e.g. diacritics looking a bit out of place. If we are
-really unlucky, the base character and the combining characters may be
-picked from different fonts, making the result look even more awkward.
-
-When rendering a pre-composed character, we are rendering a single
-glyph only and thus it is guaranteed to look the way the font designer
-intended it to.
-
-Note that foot currently will choose to render the decomposed form
-**if** the pre-composed character **does not** exist in the primary
-font, **and** both the decomposed characters **do**. In all other
-cases, the pre-composed character is preferred.
-
-Still, if you do not want this, you can disable pre-composing at
-**compile time** with `-Dunicode-precompose=false`.
-
-
 ## Requirements
 
 ### Running

meson.build

@@ -58,9 +58,6 @@ wayland_client = dependency('wayland-client')
 wayland_cursor = dependency('wayland-cursor')
 xkb = dependency('xkbcommon')
 
-add_project_arguments('-DFOOT_UNICODE_PRECOMPOSE=@0@'.format(
-  get_option('unicode-precompose')), language: 'c')
-
 tllist = dependency('tllist', version: '>=1.0.1', fallback: 'tllist')
 fcft = dependency('fcft', version: ['>=2.1.0', '<3.0.0'], fallback: 'fcft')
 
@@ -153,9 +150,9 @@ install_data('footrc', install_dir: join_paths(get_option('datadir'), 'foot'))
 subdir('completions')
 subdir('doc')
 
-summary(
-  {
-    'Unicode precompose': get_option('unicode-precompose'),
-  },
-  bool_yn: true
-)
+# summary(
+#   {
+#     '<feature>': false,
+#   },
+#   bool_yn: true
+# )

meson_options.txt

@@ -1,2 +0,0 @@
-option('unicode-precompose', type: 'boolean', value: true,
-       description: 'Convert decomposed characters to precomposed. Ignored if "unicode-combining" has been disabled')

vt.c

@@ -595,7 +595,6 @@ action_utf8_print(struct terminal *term, uint8_t c)
             term->grid->cursor.point.col = base_col;
             term->grid->cursor.lcf = false;
 
-#if FOOT_UNICODE_PRECOMPOSE
             if (composed == NULL) {
                 bool base_from_primary;
                 bool comb_from_primary;
@@ -627,7 +626,6 @@ action_utf8_print(struct terminal *term, uint8_t c)
                     return;
                 }
             }
-#endif
 
             size_t wanted_count = composed != NULL ? composed->count + 1 : 1;
             if (wanted_count > ALEN(composed->combining)) {