Improve filtering in the library

The filter box is now located at the top of the library tree,
as most search boxes are placed above the elements they search in.

Pressing Ctrl + F will now focus the filter box as well.

addons/material_maker/library.gd

@@ -4,6 +4,7 @@ extends VBoxContainer
 var libraries = []
 
 onready var tree : Tree = $Tree
+onready var filter_line_edit : LineEdit = $HBoxContainer/Filter
 
 func _ready():
 	tree.set_column_expand(0, true)
@@ -15,6 +16,10 @@ func _ready():
 	add_library("user://library/user.json")
 	update_tree()
 
+func _unhandled_input(event : InputEvent) -> void:
+	if event is InputEventKey and event.pressed and event.command and event.scancode == KEY_F:
+		filter_line_edit.grab_focus()
+
 func get_selected_item_name():
 	var tree_item : TreeItem = tree.get_selected()
 	var rv = ""

addons/material_maker/library.tscn

@@ -7,22 +7,13 @@
 margin_right = 352.0
 margin_bottom = 423.0
 script = ExtResource( 1 )
-
-[node name="Tree" type="Tree" parent="."]
-margin_right = 352.0
-margin_bottom = 395.0
-rect_min_size = Vector2( 100, 100 )
-size_flags_horizontal = 3
-size_flags_vertical = 3
-columns = 2
-hide_root = true
-select_mode = 1
-script = ExtResource( 2 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
 
 [node name="HBoxContainer" type="HBoxContainer" parent="."]
-margin_top = 399.0
 margin_right = 352.0
-margin_bottom = 423.0
+margin_bottom = 24.0
 size_flags_horizontal = 3
 
 [node name="FilterLabel" type="Label" parent="HBoxContainer"]
@@ -36,4 +27,16 @@ margin_left = 41.0
 margin_right = 352.0
 margin_bottom = 24.0
 size_flags_horizontal = 3
+
+[node name="Tree" type="Tree" parent="."]
+margin_top = 28.0
+margin_right = 352.0
+margin_bottom = 423.0
+rect_min_size = Vector2( 100, 100 )
+size_flags_horizontal = 3
+size_flags_vertical = 3
+columns = 2
+hide_root = true
+select_mode = 1
+script = ExtResource( 2 )
 [connection signal="text_changed" from="HBoxContainer/Filter" to="." method="_on_Filter_text_changed"]