Simplify window resizing to accommodate 11.2 API changes

Fixes #16. In 11.2 Blizzard made it so ClearAllPoints() invalidates the rect immediately, rather than the rect continuing to be a target that we can query GetLeft() and GetTop() from.

Author: brittyazel

DevTool.lua

@@ -410,6 +410,10 @@ function DevTool:ResizeMainFrame()
 	local left = self.MainWindow:GetLeft()
 	local top = self.MainWindow:GetTop()
 
+	-- Pin the top left corner of the main window in place so we only resize from the bottom right corner
+	self.MainWindow:ClearAllPoints()
+	self.MainWindow:SetPoint("TOPLEFT", nil, "TOPLEFT", left, (-1 * (UIParent:GetHeight() - top)))
+
 	local x, y = GetCursorPosition()
 	local s = self.MainWindow:GetEffectiveScale()
 	x = x / s
@@ -426,8 +430,7 @@ function DevTool:ResizeMainFrame()
 
 	end
 
-	self.MainWindow:SetSize(DevTool.CalculatePosition(x - left, minX, maxX),
-			DevTool.CalculatePosition(top - y, minY, maxY))
+	self.MainWindow:SetSize(DevTool.CalculatePosition(x - left, minX, maxX), DevTool.CalculatePosition(top - y, minY, maxY))
 end
 
 function DevTool:ResizeColumn(firstRun)
@@ -444,7 +447,8 @@ function DevTool:ResizeColumn(firstRun)
 	end
 
 	self.MainWindow.columnResizer:ClearAllPoints()
-	self.MainWindow.columnResizer:SetPoint("TOPRIGHT", self.MainWindow, "TOPRIGHT", self.db.profile.collResizeWidth * -1, -30) -- 30 is offset from above (top buttons)
+	-- -30 is vertical offset from above (top buttons)
+	self.MainWindow.columnResizer:SetPoint("TOPRIGHT", self.MainWindow, "TOPRIGHT", self.db.profile.collResizeWidth * -1, -30)
 end
 
 -----------------------------------------------------------------------------------------------

XML/MainFrame.xml

@@ -328,18 +328,13 @@ https://raw.githubusercontent.com/Gethe/wow-ui-source/live/Interface/FrameXML/UI
                         self:RegisterForDrag("LeftButton");
                     </OnLoad>
                     <OnDragStart>
-                        self:GetParent():ClearAllPoints()
-                        self:GetParent():SetPoint("TOPLEFT", nil, "TOPLEFT",
-                                self:GetParent():GetLeft(), (-1 * (UIParent:GetHeight() - self:GetParent():GetTop())))
                         self:SetButtonState("PUSHED", true);
                         self:GetHighlightTexture():Hide();
-
                         self.updateTimer = DevTool:ScheduleRepeatingTimer("ResizeUpdateTick", 0.01)
                     </OnDragStart>
                     <OnDragStop>
                         DevTool:CancelTimer(self.updateTimer)
-                        --call one final time to let go of the cursor
-                        DevTool:ResizeUpdateTick()
+                        DevTool:ResizeUpdateTick() --call one final time to let go of the cursor
                         self:SetButtonState("NORMAL", false);
                         self:GetHighlightTexture():Show();
                     </OnDragStop>