[RTL] Fix dropcaps and list prefixes not taking visible characters into account.

Author: bruvzg

scene/gui/rich_text_label.cpp

@@ -835,10 +835,13 @@ int RichTextLabel::_draw_line(ItemFrame *p_frame, int p_line, const Vector2 &p_o
 	// Draw dropcap.
 	int dc_lines = l.text_buf->get_dropcap_lines();
 	float h_off = l.text_buf->get_dropcap_size().x;
-	if (l.dc_ol_size > 0) {
-		l.text_buf->draw_dropcap_outline(ci, p_ofs + ((rtl) ? Vector2() : Vector2(l.offset.x, 0)), l.dc_ol_size, l.dc_ol_color);
+	bool skip_dc = (trim_chars && l.char_offset > visible_characters) || (trim_glyphs_ltr && (r_processed_glyphs >= visible_glyphs)) || (trim_glyphs_rtl && (r_processed_glyphs < total_glyphs - visible_glyphs));
+	if (!skip_dc) {
+		if (l.dc_ol_size > 0) {
+			l.text_buf->draw_dropcap_outline(ci, p_ofs + ((rtl) ? Vector2() : Vector2(l.offset.x, 0)), l.dc_ol_size, l.dc_ol_color);
+		}
+		l.text_buf->draw_dropcap(ci, p_ofs + ((rtl) ? Vector2() : Vector2(l.offset.x, 0)), l.dc_color);
 	}
-	l.text_buf->draw_dropcap(ci, p_ofs + ((rtl) ? Vector2() : Vector2(l.offset.x, 0)), l.dc_color);
 
 	int line_count = 0;
 	Size2 ctrl_size = get_size();
@@ -894,7 +897,8 @@ int RichTextLabel::_draw_line(ItemFrame *p_frame, int p_line, const Vector2 &p_o
 			} break;
 		}
 
-		if (!prefix.is_empty() && line == 0) {
+		bool skip_prefix = (visible_chars_behavior == TextServer::VC_CHARS_BEFORE_SHAPING && l.char_offset == visible_characters) || (trim_chars && l.char_offset > visible_characters) || (trim_glyphs_ltr && (r_processed_glyphs >= visible_glyphs)) || (trim_glyphs_rtl && (r_processed_glyphs < total_glyphs - visible_glyphs));
+		if (!prefix.is_empty() && line == 0 && !skip_prefix) {
 			Ref<Font> font = theme_cache.normal_font;
 			int font_size = theme_cache.normal_font_size;