theme: Fixes to regressions in app grid

- fixes dash radii and spacing
- fixes running dot indicator margins
- fixes loss of mouse interaction below dash
- fixes launcher icon size issues
- fixes search padding & margin problems on low-resolution displays
- fixes with inconsistent sizing in app folders
- fixes app switcher hover state

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2185>

data/theme/gnome-shell-sass/_common.scss

@@ -84,6 +84,7 @@ stage {
 %tile {
   border-radius: $base_border_radius * 2; // 16px
   padding: $base_padding;
+  spacing: $base_padding;
   border: 2px solid transparent;
   transition-duration: 100ms;
   text-align: center;

data/theme/gnome-shell-sass/widgets/_app-grid.scss

@@ -37,7 +37,6 @@ $app_icon_size: 96px;
 .app-folder-dialog {
   border-radius: $modal_radius*2;
   background-color: $dash_background_color;
-  padding: 12px 0px 12px 0px;
 
   & .folder-name-container {
     padding: 24px 36px 0;
@@ -54,15 +53,11 @@ $app_icon_size: 96px;
     & .folder-name-label { padding: 5px 7px; color: $osd_fg_color; }
 
     & .edit-folder-button {
-      @include button(undecorated);
+      @extend %button;
+      padding: 0;
       width: 36px;
       height: 36px;
-      border-radius: 18px;
-
-      &:focus {@include button(focus);}
-      &:hover {@include button(hover);}
-      &:active {@include button(active);}
-
+      border-radius: 99px;
       & > StIcon { icon-size: $base_icon_size }
     }
   }
@@ -83,8 +78,8 @@ $app_icon_size: 96px;
 
 .app-folder-dialog-container {
   padding: $base_padding*2;
-  width: 620px;
-  height: 620px;
+  width: 640px;
+  height: 640px;
 }
 
 // Running app indicator (also shown in dash)

data/theme/gnome-shell-sass/widgets/_dash.scss

@@ -8,7 +8,7 @@ $dash_border_radius: $modal_radius + $dash_padding;
 // container for the dash
 #dash {
   @extend %caption;
-  margin: $base_margin * 3;
+  margin-top: $dash_padding;
 
   .placeholder {
     // background-image: url("resource:///org/gnome/shell/theme/dash-placeholder.svg");
@@ -24,7 +24,7 @@ $dash_border_radius: $modal_radius + $dash_padding;
 
   // Running app indicator (also shown in app grid)
   .app-well-app-running-dot {
-    margin-bottom: 15px; // hardcoded
+    margin-bottom: 14px; // hardcoded
   }
 }
 
@@ -34,6 +34,7 @@ $dash_border_radius: $modal_radius + $dash_padding;
   border-radius: $dash_border_radius;
   padding: $dash_padding;
   spacing: $base_padding;
+  margin-bottom: $dash_padding;
 }
 
 // items on the dash
@@ -49,6 +50,10 @@ $dash_border_radius: $modal_radius + $dash_padding;
 
   // show apps button
   .show-apps { @include overview_icon($osd_fg_color);}
+
+  .show-apps, .app-well-app {
+    padding-bottom: $dash_padding;
+  }
 }
 
 // separator between favourites and running apps
@@ -56,6 +61,7 @@ $dash_border_radius: $modal_radius + $dash_padding;
   width: 1px;
   margin: 0 $base_margin;
   background-color: $borders_color;
+  margin-bottom: $dash_padding;
 }
 
 // OSD Tooltip

data/theme/gnome-shell-sass/widgets/_switcher-popup.scss

@@ -25,8 +25,9 @@ $switcher_border_radius: $modal_radius + 8px;
 
   // each item in the list
   .item-box {
-
     @include tile_button($osd_fg_color);
+    // override over style so mouse doesn't steal focus
+    &:hover {background: none;}
   }
 
   .separator {