ui: Fixes for upcoming release

* improved comment colors in all color schemes
* improved contrasts for dark color scheme
* fixed error locations stay visible when activating file in single file view
* removed scroll speed change listener from search autocompletion because it caused slowdown on macOS
* fixed bounding rects of graph edges to contain arrow
* fixed tooltip list shown with just one element

bin/app/data/color_schemes/bad_rainbow.xml

@@ -119,7 +119,7 @@
 				<directive>#00A0B6</directive>
 				<keyword>#00A0B6</keyword>
 				<type>#FF4A52</type>
-				<comment>#A0A0A4</comment>
+				<comment>#9DC28D</comment>
 				<number>#EE7326</number>
 				<quotation>#D663D6</quotation>
 				<function>#FBBA00</function>

bin/app/data/color_schemes/bright.xml

@@ -119,7 +119,7 @@
 				<directive>#1B8856</directive>
 				<keyword>#1B8856</keyword>
 				<type>#C1492D</type>
-				<comment>#1A801A</comment>
+				<comment>#287299</comment>
 				<number>#C1315E</number>
 				<quotation>#865F9E</quotation>
 				<function>#CC9533</function>

bin/app/data/color_schemes/dark.xml

@@ -119,7 +119,7 @@
 				<directive>#1F9C62</directive>
 				<keyword>#1F9C62</keyword>
 				<type>#D95233</type>
-				<comment>#A0A0A4</comment>
+				<comment>#487F9C</comment>
 				<number>#CC3463</number>
 				<quotation>#9368AD</quotation>
 				<function>#D69C36</function>
@@ -137,12 +137,12 @@
 						<fill>transparent</fill>
 					</normal>
 					<focus>
-						<border>#F7F7F7</border>
+						<border>#D5D5D5</border>
 						<fill>transparent</fill>
 					</focus>
 					<active>
 						<border>transparent</border>
-						<fill>#F7F7F7</fill>
+						<fill>#D5D5D5</fill>
 						<text>#272728</text>
 					</active>
 				</token>
@@ -399,8 +399,8 @@
 			</macro_use>
 
 			<aggregation>
-				<normal>#3D3D3D</normal>
-				<focus>#4D4D4D</focus>
+				<normal>#4D4D4D</normal>
+				<focus>#6D6D6D</focus>
 			</aggregation>
 		</edge>
 	</graph>

bin/app/data/gui/search_view/search_view.css

@@ -35,10 +35,10 @@ QWidget#search_box_highlight {
 
 QAbstractItemView#search_box_popup {
 	background-color: <color:search/popup/background>;
-	border: none;
+	border: 1px solid <color:search/popup/line>;
 	color: <color:search/popup/text>;
 	font-family: "<setting:font_name>";
-	margin: 8px 0 0;
+	margin: 0;
 	min-height: 26px;
 	selection-background-color: <color:search/popup/highlight>;
 }