Bug 1239670 - Memory table: Use min-width:0 on flex items to prevent overflow. r=fitzgen

--HG--
extra : source : f0b09da3f4caaf540ecce8f7474fe1e9a46c5e42

devtools/client/themes/memory.css

@@ -221,6 +221,12 @@ html, body, #app, #memory-tool {
    */
   flex: 1;
   background-color: var(--theme-toolbar-background);
+
+  /**
+   * By default, flex items have min-width: auto;
+   * (https://drafts.csswg.org/css-flexbox/#min-size-auto)
+   */
+  min-width: 0;
 }
 
 #heap-view > .heap-view-panel {
@@ -236,6 +242,12 @@ html, body, #app, #memory-tool {
    * Flexing to fill out remaining horizontal space. @see #heap-view.
    */
   flex: 1;
+
+  /**
+   * By default, flex items have min-width: auto;
+   * (https://drafts.csswg.org/css-flexbox/#min-size-auto)
+   */
+  min-width: 0;
 }
 
 #heap-view > .heap-view-panel > .snapshot-status,