[Frontend] Inspector-related fixes

open #243
Enlarged size of mini-tab icon when panes are collapsed;
Increased size of edge margin to allow for larger icons;

platform/commonUI/general/res/sass/_constants.scss

@@ -44,9 +44,10 @@ $ueAppLogoW: 105px;
 $ueEditToolBarH: 25px;
 $ueBrowseLeftPaneTreeW: 25%;
 $ueBrowseRightPaneInspectW: 20%;
-$ueCollapsedPaneEdgeM: 20px;
+$ueCollapsedPaneEdgeM: 22px;
 $uePaneMiniTabH: $ueTopBarH;
 $uePaneMiniTabW: 9px;
+$uePaneMiniTabCollapsedW: 11px;
 $ueEditLeftPaneW: 75%;
 $treeSearchInputBarH: 25px;
 $ueTimeControlH: (33px, 20px, 20px);

platform/commonUI/general/res/sass/controls/_buttons.scss

@@ -225,6 +225,11 @@ $pad: $interiorMargin * $baseRatio;
         overflow: hidden;
         word-break: break-all;
 
+        &.collapsed {
+            $d: $uePaneMiniTabCollapsedW;
+            width: $d; font-size: $d;
+        }
+
         &:before,
         &:after {
             position: absolute;