[devtools] update min width of debug panel

This patch adds a min width to the debug panel
in the sources panel to keep it from overflowing.

Bug: chrome:841745
Change-Id: Id33fb70555a1d12a732c803fdf398a165a507ada
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1786442
Commit-Queue: Jan Scheffler <janscheffler@google.com>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696731}

third_party/blink/renderer/devtools/front_end/sources/SourcesPanel.js

@@ -889,7 +889,9 @@ Sources.SourcesPanel = class extends UI.Panel {
     const vbox = new UI.VBox();
     vbox.element.appendChild(this._debugToolbar.element);
     vbox.element.appendChild(this._debugToolbarDrawer);
-    vbox.setMinimumAndPreferredSizes(25, 25, Sources.SourcesPanel.minToolbarWidth, 100);
+
+    vbox.setMinimumAndPreferredSizes(
+        Sources.SourcesPanel.minToolbarWidth, 25, Sources.SourcesPanel.minToolbarWidth, 100);
     this._sidebarPaneStack = UI.viewManager.createStackLocation(this._revealDebuggerSidebar.bind(this));
     this._sidebarPaneStack.widget().element.classList.add('overflow-auto');
     this._sidebarPaneStack.widget().show(vbox.element);