Adwaita: updates style for text selection

- use consistent widget style. unfortunately using assets
- light/dark variant
- new assets for text selestions, using existing slider asset for
  insertion point

https://bugzilla.gnome.org/show_bug.cgi?id=750396

gtk/theme/Adwaita/_common.scss

@@ -3,6 +3,7 @@
 }
 
 $ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);
+$asset_suffix: if($variant=='dark', '-dark', '');
 
 * {
   padding: 0;
@@ -36,7 +37,7 @@ $ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);
   -GtkWidget-focus-line-width: 1; //
 
   -GtkWidget-text-handle-width: 20;
-  -GtkWidget-text-handle-height: 20;
+  -GtkWidget-text-handle-height: 24;
 
   -GtkDialog-button-spacing: 4;
   -GtkDialog-action-area-border: 0;
@@ -1582,8 +1583,23 @@ column-header.button.dnd { // for treeview-like derive widgets
   background-image: none;
   box-shadow: none;
   border-style: none;
-  &.top { -gtk-icon-source: -gtk-icontheme('selection-start-symbolic'); }
-  &.bottom { -gtk-icon-source: -gtk-icontheme('selection-end-symbolic'); }
+  @each $s,$as in ('',''),
+                      (':hover','-hover'),
+                      (':active','-active') { //no need for insensitive and backdrop
+                        &.top#{$s} { 
+                          $_url: 'assets/text-select-top#{$as}#{$asset_suffix}';
+                          -gtk-icon-source: -gtk-scaled(url('#{$_url}.png'),
+                                            url('#{$_url}@2.png')); }
+                        &.bottom#{$s} { 
+                          $_url: 'assets/text-select-bottom#{$as}#{$asset_suffix}';
+                          -gtk-icon-source: -gtk-scaled(url('#{$_url}.png'),
+                                            url('#{$_url}@2.png')); }
+                        &.insertion-cursor#{$s} {
+                          $_url: 'assets/slider-horz-scale-has-marks-above#{$as}#{$asset_suffix}';
+                          -gtk-icon-source: -gtk-scaled(url('#{$_url}.png'),
+                                            url('#{$_url}@2.png'));
+                        }
+  }
 }
 
 /*****************
@@ -2097,7 +2113,6 @@ GtkSwitch {
 // draw regular check and radio items using our PNG assets
 // all assets are rendered from assets.svg. never add pngs directly
 
-$asset_suffix: if($variant=='dark', '-dark', '');
 @each $w,$a in ('check', 'checkbox'),
                ('radio','radio') {
 
@@ -2328,7 +2343,6 @@ GtkCheckButton.text-button, GtkRadioButton.text-button {
   }
 }
 
-$asset_suffix: if($variant=='dark', '-dark', '');
 @each $d,$dn in ('', 'horz'),
                 ('.vertical', 'vert') {
   @each $w,$we in  ('scale-has-marks-below','scale_marks_below'),

gtk/theme/Adwaita/assets.txt

@@ -70,6 +70,18 @@ selected-radio-mixed-active
 selected-radio-mixed-insensitive
 selected-radio-mixed-backdrop
 selected-radio-mixed-backdrop-insensitive
+text-select-bottom
+text-select-bottom-hover
+text-select-bottom-active
+text-select-top
+text-select-top-hover
+text-select-top-active
+text-select-bottom-dark
+text-select-bottom-hover-dark
+text-select-bottom-active-dark
+text-select-top-dark
+text-select-top-hover-dark
+text-select-top-active-dark
 checkbox-checked-dark
 checkbox-checked-hover-dark
 checkbox-checked-active-dark

gtk/theme/Adwaita/gtk-contained-dark.css

@@ -17,7 +17,7 @@
   -GtkWidget-focus-padding: 2;
   -GtkWidget-focus-line-width: 1;
   -GtkWidget-text-handle-width: 20;
-  -GtkWidget-text-handle-height: 20;
+  -GtkWidget-text-handle-height: 24;
   -GtkDialog-button-spacing: 4;
   -GtkDialog-action-area-border: 0;
   -GtkStatusbar-shadow-type: none;
@@ -2061,10 +2061,31 @@ column-header .titlebar .button.titlebutton,
   border-style: none; }
   .entry.cursor-handle.top,
   .cursor-handle.top {
-    -gtk-icon-source: -gtk-icontheme("selection-start-symbolic"); }
+    -gtk-icon-source: -gtk-scaled(url("assets/text-select-top-dark.png"), url("assets/text-select-top-dark@2.png")); }
   .entry.cursor-handle.bottom,
   .cursor-handle.bottom {
-    -gtk-icon-source: -gtk-icontheme("selection-end-symbolic"); }
+    -gtk-icon-source: -gtk-scaled(url("assets/text-select-bottom-dark.png"), url("assets/text-select-bottom-dark@2.png")); }
+  .entry.cursor-handle.insertion-cursor,
+  .cursor-handle.insertion-cursor {
+    -gtk-icon-source: -gtk-scaled(url("assets/slider-horz-scale-has-marks-above-dark.png"), url("assets/slider-horz-scale-has-marks-above-dark@2.png")); }
+  .entry.cursor-handle.top:hover,
+  .cursor-handle.top:hover {
+    -gtk-icon-source: -gtk-scaled(url("assets/text-select-top-hover-dark.png"), url("assets/text-select-top-hover-dark@2.png")); }
+  .entry.cursor-handle.bottom:hover,
+  .cursor-handle.bottom:hover {
+    -gtk-icon-source: -gtk-scaled(url("assets/text-select-bottom-hover-dark.png"), url("assets/text-select-bottom-hover-dark@2.png")); }
+  .entry.cursor-handle.insertion-cursor:hover,
+  .cursor-handle.insertion-cursor:hover {
+    -gtk-icon-source: -gtk-scaled(url("assets/slider-horz-scale-has-marks-above-hover-dark.png"), url("assets/slider-horz-scale-has-marks-above-hover-dark@2.png")); }
+  .entry.cursor-handle.top:active,
+  .cursor-handle.top:active {
+    -gtk-icon-source: -gtk-scaled(url("assets/text-select-top-active-dark.png"), url("assets/text-select-top-active-dark@2.png")); }
+  .entry.cursor-handle.bottom:active,
+  .cursor-handle.bottom:active {
+    -gtk-icon-source: -gtk-scaled(url("assets/text-select-bottom-active-dark.png"), url("assets/text-select-bottom-active-dark@2.png")); }
+  .entry.cursor-handle.insertion-cursor:active,
+  .cursor-handle.insertion-cursor:active {
+    -gtk-icon-source: -gtk-scaled(url("assets/slider-horz-scale-has-marks-above-active-dark.png"), url("assets/slider-horz-scale-has-marks-above-active-dark@2.png")); }
 
 /*****************
  * Notebooks and *

gtk/theme/Adwaita/gtk-contained.css

@@ -17,7 +17,7 @@
   -GtkWidget-focus-padding: 2;
   -GtkWidget-focus-line-width: 1;
   -GtkWidget-text-handle-width: 20;
-  -GtkWidget-text-handle-height: 20;
+  -GtkWidget-text-handle-height: 24;
   -GtkDialog-button-spacing: 4;
   -GtkDialog-action-area-border: 0;
   -GtkStatusbar-shadow-type: none;
@@ -2067,10 +2067,31 @@ column-header .titlebar .button.titlebutton,
   border-style: none; }
   .entry.cursor-handle.top,
   .cursor-handle.top {
-    -gtk-icon-source: -gtk-icontheme("selection-start-symbolic"); }
+    -gtk-icon-source: -gtk-scaled(url("assets/text-select-top.png"), url("assets/text-select-top@2.png")); }
   .entry.cursor-handle.bottom,
   .cursor-handle.bottom {
-    -gtk-icon-source: -gtk-icontheme("selection-end-symbolic"); }
+    -gtk-icon-source: -gtk-scaled(url("assets/text-select-bottom.png"), url("assets/text-select-bottom@2.png")); }
+  .entry.cursor-handle.insertion-cursor,
+  .cursor-handle.insertion-cursor {
+    -gtk-icon-source: -gtk-scaled(url("assets/slider-horz-scale-has-marks-above.png"), url("assets/slider-horz-scale-has-marks-above@2.png")); }
+  .entry.cursor-handle.top:hover,
+  .cursor-handle.top:hover {
+    -gtk-icon-source: -gtk-scaled(url("assets/text-select-top-hover.png"), url("assets/text-select-top-hover@2.png")); }
+  .entry.cursor-handle.bottom:hover,
+  .cursor-handle.bottom:hover {
+    -gtk-icon-source: -gtk-scaled(url("assets/text-select-bottom-hover.png"), url("assets/text-select-bottom-hover@2.png")); }
+  .entry.cursor-handle.insertion-cursor:hover,
+  .cursor-handle.insertion-cursor:hover {
+    -gtk-icon-source: -gtk-scaled(url("assets/slider-horz-scale-has-marks-above-hover.png"), url("assets/slider-horz-scale-has-marks-above-hover@2.png")); }
+  .entry.cursor-handle.top:active,
+  .cursor-handle.top:active {
+    -gtk-icon-source: -gtk-scaled(url("assets/text-select-top-active.png"), url("assets/text-select-top-active@2.png")); }
+  .entry.cursor-handle.bottom:active,
+  .cursor-handle.bottom:active {
+    -gtk-icon-source: -gtk-scaled(url("assets/text-select-bottom-active.png"), url("assets/text-select-bottom-active@2.png")); }
+  .entry.cursor-handle.insertion-cursor:active,
+  .cursor-handle.insertion-cursor:active {
+    -gtk-icon-source: -gtk-scaled(url("assets/slider-horz-scale-has-marks-above-active.png"), url("assets/slider-horz-scale-has-marks-above-active@2.png")); }
 
 /*****************
  * Notebooks and *