Fix thin lines in editor gui on hidpi (issue 14691)

scene/gui/rich_text_label.cpp

@@ -31,6 +31,11 @@
 #include "os/keyboard.h"
 #include "os/os.h"
 #include "scene/scene_string_names.h"
+
+#ifdef TOOLS_ENABLED
+#include "editor/editor_node.h"
+#endif
+
 RichTextLabel::Item *RichTextLabel::_get_next_item(Item *p_item, bool p_free) {
 
 	if (p_free) {
@@ -370,7 +375,11 @@ int RichTextLabel::_process_line(ItemFrame *p_frame, const Vector2 &p_ofs, int &
 									Color uc = color;
 									uc.a *= 0.5;
 									int uy = y + lh - fh + ascent + 2;
-									VS::get_singleton()->canvas_item_add_line(ci, p_ofs + Point2(align_ofs + pofs, uy), p_ofs + Point2(align_ofs + pofs + cw, uy), uc);
+									float underline_width = 1.0;
+#ifdef TOOLS_ENABLED
+									underline_width *= EDSCALE;
+#endif
+									VS::get_singleton()->canvas_item_add_line(ci, p_ofs + Point2(align_ofs + pofs, uy), p_ofs + Point2(align_ofs + pofs + cw, uy), uc, underline_width);
 								}
 								ofs += cw;
 							}

scene/gui/tree.cpp

@@ -30,6 +30,7 @@
 #include "tree.h"
 #include <limits.h>
 
+#include "math_funcs.h"
 #include "os/input.h"
 #include "os/keyboard.h"
 #include "os/os.h"
@@ -37,6 +38,10 @@
 #include "project_settings.h"
 #include "scene/main/viewport.h"
 
+#ifdef TOOLS_ENABLED
+#include "editor/editor_node.h"
+#endif
+
 void TreeItem::move_to_top() {
 
 	if (!parent || parent->childs == this)
@@ -1412,9 +1417,14 @@ int Tree::draw_item(const Point2i &p_pos, const Point2 &p_draw_ofs, const Size2
 				if (c->get_children() != NULL)
 					root_pos -= Point2i(cache.arrow->get_width(), 0);
 
+				float line_width = 1.0;
+#ifdef TOOLS_ENABLED
+				line_width *= EDSCALE;
+#endif
+
 				Point2i parent_pos = Point2i(parent_ofs - cache.arrow->get_width() / 2, p_pos.y + label_h / 2 + cache.arrow->get_height() / 2) - cache.offset + p_draw_ofs;
-				VisualServer::get_singleton()->canvas_item_add_line(ci, root_pos, Point2i(parent_pos.x, root_pos.y), cache.relationship_line_color);
-				VisualServer::get_singleton()->canvas_item_add_line(ci, Point2i(parent_pos.x, root_pos.y), parent_pos, cache.relationship_line_color);
+				VisualServer::get_singleton()->canvas_item_add_line(ci, root_pos, Point2i(parent_pos.x - Math::floor(line_width / 2), root_pos.y), cache.relationship_line_color, line_width);
+				VisualServer::get_singleton()->canvas_item_add_line(ci, Point2i(parent_pos.x, root_pos.y), parent_pos, cache.relationship_line_color, line_width);
 			}
 
 			int child_h = draw_item(children_pos, p_draw_ofs, p_draw_size, c);