[Frontend] Improve layout of "locator"

Fixes #1118
Locator in Save In, Move, etc. dialog now
expands vertically to use as much vertical as
possible;

platform/commonUI/general/res/sass/forms/_elems.scss

@@ -25,11 +25,21 @@
 
 .form {
 	color: $colorFormText;
+    height: 100%;
     width: 100%;
-	.form-section {
-		position: relative;
-		margin-bottom: $interiorMarginLg * 2;
-	}
+
+    .l-form-section {
+        position: relative;
+        &.grows {
+            .l-section-body,
+            .form-row {
+                @include flex(1 1 auto);
+                .wrapper {
+                    height: 100%;
+                }
+            }
+        }
+    }
 
     .section-header {
         border-radius: $basicCr;
@@ -43,10 +53,14 @@
 	.form-row {
 		$m: $interiorMargin;
 		box-sizing: border-box;
-		@include clearfix;
 		border-top: 1px solid $colorFormLines;
+        margin-bottom: $interiorMarginLg * 2;
 		padding: $formTBPad 0;
 		position: relative;
+        //&ng-form {
+        //    display: block;
+        //}
+
 		&.first {
 			border-top: none;
 		}
@@ -92,9 +106,9 @@
 		.selector-list {
 			// Used in create overlay to display tree view
 			@include nice-input();
-			$h: 150px;
 			position: relative;
-			height: $h;
+            min-height: 150px;
+			height: 100%;
 			>.wrapper {
 				$p: $interiorMargin;
 				overflow: auto;