feat: add windowrule option scroller_proportion_single

src/mango.c

@@ -376,6 +376,7 @@ struct Client {
 	int tearing_hint;
 	int force_tearing;
 	int allow_shortcuts_inhibit;
+	float scroller_proportion_single;
 };
 
 typedef struct {
@@ -1173,6 +1174,7 @@ static void apply_rule_properties(Client *c, const ConfigWinRule *r) {
 	APPLY_INT_PROP(c, r, allow_shortcuts_inhibit);
 
 	APPLY_FLOAT_PROP(c, r, scroller_proportion);
+	APPLY_FLOAT_PROP(c, r, scroller_proportion_single);
 	APPLY_FLOAT_PROP(c, r, focused_opacity);
 	APPLY_FLOAT_PROP(c, r, unfocused_opacity);
 
@@ -3623,6 +3625,7 @@ void init_client_properties(Client *c) {
 	c->force_maximize = 0;
 	c->force_tearing = 0;
 	c->allow_shortcuts_inhibit = SHORTCUTS_INHIBIT_ENABLE;
+	c->scroller_proportion_single = 0.0f;
 }
 
 void // old fix to 0.5