Update default sidebar section header colors (fixes #93764)

extensions/theme-defaults/themes/dark_defaults.json

@@ -17,7 +17,9 @@
 		"menu.background": "#252526",
 		"menu.foreground": "#CCCCCC",
 		"statusBarItem.remoteForeground": "#FFF",
-		"statusBarItem.remoteBackground": "#16825D"
+		"statusBarItem.remoteBackground": "#16825D",
+		"sideBarSectionHeader.background": "#0000",
+		"sideBarSectionHeader.border": "#ccc3"
 	},
 	"semanticHighlighting": true
 }

extensions/theme-defaults/themes/light_defaults.json

@@ -17,7 +17,9 @@
 		"settings.textInputBorder": "#CECECE",
 		"settings.numberInputBorder": "#CECECE",
 		"statusBarItem.remoteForeground": "#FFF",
-		"statusBarItem.remoteBackground": "#16825D"
+		"statusBarItem.remoteBackground": "#16825D",
+		"sideBarSectionHeader.background": "#0000",
+		"sideBarSectionHeader.border": "#61616130"
 	},
 	"semanticHighlighting": true
 }

src/vs/workbench/browser/parts/views/media/paneviewlet.css

@@ -3,9 +3,6 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-.monaco-pane-view .split-view-view:first-of-type > .pane > .pane-header {
-	border-top: none !important; /* less clutter: do not show any border for first views in a pane */
-}
 .monaco-pane-view .split-view-view:first-of-type > .pane {
 	border-left: none !important; /* less clutter: do not show any border for first views in a pane */
 }