Bug 1426920 - Netmonitor ResponsePanel's editor-row-container should occupy the available vertical space r=gasolin

MozReview-Commit-ID: Jkn26LAyovK

--HG--
extra : rebase_source : 2a3c935d083c04de629880fab6995f21fca26abf

devtools/client/netmonitor/src/assets/styles/NetworkDetailsPanel.css

@@ -158,6 +158,7 @@
 .network-monitor .tree-container .treeTable tr:last-child td[colspan="2"] {
   display: block;
   height: 100%;
+  flex: 1;
 }
 
 .network-monitor .source-editor-mount {