ux: repository page layout (#2660)

- Max width of left sidebar & right content page
- Min width of left part in `LOCAL CHANGES` page and `STASHES` page

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Views/Repository.axaml

@@ -11,9 +11,9 @@
              x:DataType="vm:Repository">
   <Grid>
     <Grid.ColumnDefinitions>
-      <ColumnDefinition Width="{Binding Source={x:Static vm:Preferences.Instance}, Path=Layout.RepositorySidebarWidth, Mode=TwoWay}" MinWidth="200" MaxWidth="500"/>
+      <ColumnDefinition Width="{Binding Source={x:Static vm:Preferences.Instance}, Path=Layout.RepositorySidebarWidth, Mode=TwoWay}" MinWidth="200"/>
       <ColumnDefinition Width="3"/>
-      <ColumnDefinition Width="*"/>
+      <ColumnDefinition Width="*" MinWidth="200"/>
     </Grid.ColumnDefinitions>
 
     <!-- Left Panel -->

src/Views/StashesPage.axaml.cs

@@ -22,10 +22,10 @@ private void OnMainLayoutSizeChanged(object sender, SizeChangedEventArgs e)
 
             var layout = ViewModels.Preferences.Instance.Layout;
             var width = grid.Bounds.Width;
-            var maxLeft = width - 304;
+            var leftWidth = Math.Max(width - 304, 300);
 
-            if (layout.StashesLeftWidth.Value - maxLeft > 1.0)
-                layout.StashesLeftWidth = new GridLength(maxLeft, GridUnitType.Pixel);
+            if (layout.StashesLeftWidth.Value - leftWidth > 1.0)
+                layout.StashesLeftWidth = new GridLength(leftWidth, GridUnitType.Pixel);
         }
 
         private async void OnStashListKeyDown(object sender, KeyEventArgs e)

src/Views/WorkingCopy.axaml.cs

@@ -25,10 +25,10 @@ private void OnMainLayoutSizeChanged(object sender, SizeChangedEventArgs e)
 
             var layout = ViewModels.Preferences.Instance.Layout;
             var width = grid.Bounds.Width;
-            var maxLeft = width - 304;
+            var leftWidth = Math.Max(width - 304, 300);
 
-            if (layout.WorkingCopyLeftWidth.Value - maxLeft > 1.0)
-                layout.WorkingCopyLeftWidth = new GridLength(maxLeft, GridUnitType.Pixel);
+            if (layout.WorkingCopyLeftWidth.Value - leftWidth > 1.0)
+                layout.WorkingCopyLeftWidth = new GridLength(leftWidth, GridUnitType.Pixel);
         }
 
         private async void OnOpenAssumeUnchanged(object sender, RoutedEventArgs e)