Repository: microsoft/terminal (language: cpp)

Issue:
AGI-P1 Maximize icon should be rounded
### Windows Terminal version

1.13.10333.0

### Windows build number

_No response_

### Other Software

_No response_

### Steps to reproduce

In our latest update to Preview, we added the snap assist functionality to the min/max/close control. Along with this and moving towards the Windows 11 styling, we should also make the maximize icon a rounded square.

### Expected Behavior

It should look something like this (taken from PowerPoint):
![image](https://user-images.githubusercontent.com/48369326/153053503-30c2fc38-570b-4853-a2e3-9736ead839ce.png)

### Actual Behavior

Currently it looks like this:
![image](https://user-images.githubusercontent.com/48369326/153053404-0d31e5ef-951a-460a-a180-ac3ead478d86.png)


Discussion / hints:
Looks fixed in 1.13.10395.0

![image](https://user-images.githubusercontent.com/343550/153776265-479bfbb5-b6af-421c-98d1-3c8f2c5c3029.png)

(top is Windows Terminal, bottom is PowerPoint)
👀 

I'm pretty sure we didn't actually do anything to fix this yet:
![image](https://user-images.githubusercontent.com/18356694/153863849-d739a2c8-0b80-4d4e-9ef8-6b9019c1f4bd.png)


Fix patch:
diff --git a/src/cascadia/TerminalApp/MinMaxCloseControl.xaml b/src/cascadia/TerminalApp/MinMaxCloseControl.xaml
index 684831586bc..cbfe7d9928e 100644
--- a/src/cascadia/TerminalApp/MinMaxCloseControl.xaml
+++ b/src/cascadia/TerminalApp/MinMaxCloseControl.xaml
@@ -247,9 +247,10 @@
             Click="_MaximizeClick"
             Style="{StaticResource CaptionButton}">
         <Button.Resources>
+            <!--  These paths are complicated, but taken directly from WinUI's WindowCaptionButton paths.  -->
             <ResourceDictionary>
-                <x:String x:Key="CaptionButtonPath">M 0 0 H 10 V 10 H 0 V 0</x:String>
-                <x:String x:Key="CaptionButtonPathWindowMaximized">M 0 2 h 8 v 8 h -8 v -8 M 2 2 v -2 h 8 v 8 h -2</x:String>
+                <x:String x:Key="CaptionButtonPath">M 1.516 -0.001 L 7.451 0.009 C 8.751 0.019 9 1 8.981 1.477 L 9.002 7.558 M 9.002 7.547 C 8.929 8.669 8 9 7.43 9.015 L 1.464 9.005 C 0.374 8.973 0 8 -0.004 7.484 L -0.004 1.477 C 0 1 0.415 0.009 1.527 -0.001</x:String>
+                <x:String x:Key="CaptionButtonPathWindowMaximized">M 1.516 -0.001 L 7.451 0.009 C 8.751 0.019 9 1 8.981 1.477 L 9.002 7.558 M 11 6 L 11 2 C 11 0 10 -2 8.011 -1.946 L 7.06 -1.969 L 3 -2 M 9.002 7.547 C 8.929 8.669 8 9 7.43 9.015 L 1.464 9.005 C 0.374 8.973 0 8 -0.004 7.484 L -0.004 1.477 C 0 1 0.415 0.009 1.527 -0.001</x:String>
             </ResourceDictionary>
         </Button.Resources>
         <ToolTipService.ToolTip>


Test patch: