Take into account the current zoom level when grabbing polygon points in the TileSet editor.

The transform of the TileSet editor workspace is now used to calculate the distance from the mouse click to the nearest polygon point.

Fixes https://github.com/godotengine/godot/issues/34001

editor/plugins/tile_set_editor_plugin.cpp

@@ -1529,13 +1529,15 @@ void TileSetEditor::_on_workspace_input(const Ref<InputEvent> &p_ie) {
 						shape_anchor.y *= (size.y + spacing);
 					}
 					const real_t grab_threshold = EDITOR_GET("editors/poly_editor/point_grab_radius");
+					Transform2D xform = workspace->get_transform();
 					shape_anchor += current_tile_region.position;
 					if (tools[TOOL_SELECT]->is_pressed()) {
 						if (mb.is_valid()) {
 							if (mb->is_pressed() && mb->get_button_index() == BUTTON_LEFT) {
 								if (edit_mode != EDITMODE_PRIORITY && current_shape.size() > 0) {
 									for (int i = 0; i < current_shape.size(); i++) {
-										if ((current_shape[i] - mb->get_position()).length_squared() <= grab_threshold) {
+										const real_t distance = xform.xform(current_shape[i]).distance_to(xform.xform(mb->get_position()));
+										if (distance < grab_threshold) {
 											dragging_point = i;
 											workspace->update();
 											return;
@@ -1634,7 +1636,8 @@ void TileSetEditor::_on_workspace_input(const Ref<InputEvent> &p_ie) {
 								pos = snap_point(pos);
 								if (creating_shape) {
 									if (current_shape.size() > 0) {
-										if ((pos - current_shape[0]).length_squared() <= grab_threshold) {
+										const real_t distance = xform.xform(current_shape[0]).distance_to(xform.xform(pos));
+										if (distance <= grab_threshold) {
 											if (current_shape.size() > 2) {
 												close_shape(shape_anchor);
 												workspace->update();
@@ -1685,7 +1688,8 @@ void TileSetEditor::_on_workspace_input(const Ref<InputEvent> &p_ie) {
 								}
 							} else if (!mb->is_pressed() && mb->get_button_index() == BUTTON_LEFT) {
 								if (creating_shape) {
-									if ((current_shape[0] - current_shape[1]).length_squared() <= grab_threshold) {
+									const real_t distance = xform.xform(current_shape[0]).distance_to(xform.xform(current_shape[1]));
+									if (distance <= grab_threshold) {
 										current_shape.set(0, snap_point(shape_anchor));
 										current_shape.set(1, snap_point(shape_anchor + Vector2(current_tile_region.size.x, 0)));
 										current_shape.set(2, snap_point(shape_anchor + current_tile_region.size));