Update LineEdit to include read_only StyleBox in get_minimum_size()

Fixes #90522

scene/gui/line_edit.cpp

@@ -1805,7 +1805,6 @@ void LineEdit::clear_internal() {
 }
 
 Size2 LineEdit::get_minimum_size() const {
-	Ref<StyleBox> style = theme_cache.normal;
 	Ref<Font> font = theme_cache.font;
 	int font_size = theme_cache.font_size;
 
@@ -1834,7 +1833,8 @@ Size2 LineEdit::get_minimum_size() const {
 	}
 	min_size.width += icon_max_width;
 
-	return style->get_minimum_size() + min_size;
+	Size2 style_min_size = theme_cache.normal->get_minimum_size().max(theme_cache.read_only->get_minimum_size());
+	return style_min_size + min_size;
 }
 
 void LineEdit::deselect() {