Merge branch 'tweak-damage-everything' into master

config.c

@@ -1361,6 +1361,9 @@ parse_section_tweak(
     if (strcmp(key, "allow-overflowing-double-width-glyphs") == 0)
         conf->tweak.allow_overflowing_double_width_glyphs = str_to_bool(value);
 
+    else if (strcmp(key, "damage-whole-window") == 0)
+        conf->tweak.damage_whole_window = str_to_bool(value);
+
     else if (strcmp(key, "render-timer") == 0) {
         if (strcmp(value, "none") == 0) {
             conf->tweak.render_timer_osd = false;
@@ -1801,6 +1804,7 @@ config_load(struct config *conf, const char *conf_path, bool errors_are_fatal)
             .max_shm_pool_size = 512 * 1024 * 1024,
             .render_timer_osd = false,
             .render_timer_log = false,
+            .damage_whole_window = false,
         },
 
         .notifications = tll_init(),

config.h

@@ -147,6 +147,7 @@ struct config {
         bool allow_overflowing_double_width_glyphs;
         bool render_timer_osd;
         bool render_timer_log;
+        bool damage_whole_window;
         uint64_t delayed_render_lower_ns;
         uint64_t delayed_render_upper_ns;
         off_t max_shm_pool_size;

doc/foot.ini.5.scd

@@ -441,8 +441,8 @@ When reporting bugs, please mention if, and to what, you have changed
 any of these options.
 
 *allow-overflowing-double-width-glyphs*
-	When enabled, double width glyphs with a character width of 1 are
+	Boolean. when enabled, double width glyphs with a character width
-	allowed to overflow into the neighbouring cell.
+	of 1 are allowed to overflow into the neighbouring cell.
 	
 	One use case for this is fonts "icon" characters in the Unicode
 	private usage area, e.g. Nerd Fonts, or Powerline Fonts. Without
@@ -528,6 +528,21 @@ any of these options.
 	Default: lower=_500000_ (0.5ms), upper=_8333333_ (8.3ms - half a
 	frame interval).
 
+*damage-whole-window*
+	Boolean. When enabled, foot will 'damage' the entire window each
+	time a frame has been rendered. This forces the compositor to
+	redraw the entire window. If disabled, foot will only 'damage'
+	updated rows.
+	
+	There is normally *no* reason to enable this. However, it has been
+	seen to workaround an issue with _fractional scaling_ in _Gnome_.
+	
+	Note that enabling this option is likely to increase CPU and/or
+	GPU usage (by the compositor, not by foot), and may have a
+	negative impact on battery life.
+	
+	Default: _false_.
+
 *max-shm-pool-size-mb*
 	This option controls the amount of *virtual* memory used by the
 	pixmap memory to which the terminal screen content is rendered.

render.c

@@ -1819,6 +1819,11 @@ grid_render(struct terminal *term, bool redraw_margins)
         }
     }
 
+    if (term->conf->tweak.damage_whole_window) {
+        wl_surface_damage_buffer(
+            term->window->surface, 0, 0, INT32_MAX, INT32_MAX);
+    }
+
     wl_surface_attach(term->window->surface, buf->wl_buf, 0, 0);
     quirk_kde_damage_before_attach(term->window->surface);
     wl_surface_commit(term->window->surface);