[DevTools] Add minimum size to WebInspector.View.

Source/devtools/front_end/splitView.css

Index: Source/devtools/front_end/splitView.css
diff --git a/Source/devtools/front_end/splitView.css b/Source/devtools/front_end/splitView.css
index 74900cb8d49d2ef56371a07557dc02e8e5d60b5f..e551a35f27911b09fbf18ed12b177fea35279437 100644
--- a/Source/devtools/front_end/splitView.css
+++ b/Source/devtools/front_end/splitView.css
@@ -62,19 +62,21 @@
     z-index: 500;
 }
 
-.split-view > .split-view-resizer > .split-view-resizer-border {
-    width: 100%;
-    height: 100%;
+.split-view-resizer-border {
     pointer-events: none;
 }
 
 .split-view.vbox > .split-view-resizer > .split-view-resizer-border {
-    margin: 3px 0;
+    width: 100%;
+    margin-top: 3px;
+    height: 1px;
     border-top: 1px solid rgb(64%, 64%, 64%);
 }
 
 .split-view.hbox > .split-view-resizer > .split-view-resizer-border {
-    margin: 0 3px;
+    height: 100%;
+    margin-left: 3px;
+    width: 1px;
     border-left: 1px solid rgb(64%, 64%, 64%);
 }