In MainPanel:ToggleState(): Record the panel's coords before expanding or contracting to avoid making it jump when re-setting its anchors.

diff --git a/Frame.lua b/Frame.lua
index 521c329..0194f45 100644
--- a/Frame.lua
+++ b/Frame.lua
@@ -1161,6 +1161,8 @@ function MainPanel:HighlightCategory(target)
 end

 function MainPanel:ToggleState()
+	local x, y = self:GetLeft(), self:GetBottom()
+
 	if self.is_expanded then
 		self:SetWidth(MAINPANEL_NORMAL_WIDTH)

@@ -1180,8 +1182,6 @@ function MainPanel:ToggleState()
 	end
 	self.is_expanded = not self.is_expanded

-	local x, y = self:GetLeft(), self:GetBottom()
-
 	self:ClearAllPoints()
 	self:SetPoint("BOTTOMLEFT", UIParent, "BOTTOMLEFT", x, y)
 	self:UpdateTitle()