SPR-908: all z-indices are found in base_structure.less,

SPR-908: Bugfix Direct-nav in Tableview should be above toggle button

css/area_main-sidebar-nav.less

@@ -119,7 +119,6 @@
             &:focus,
             &:active {
                 position: relative; // always show label, even with collapsed sidebar
-                z-index: 100; // show label/link above content on hover etc.
                 width: 100%;
                 background-color: @ini_nav_menu_hover_bg;
                 border-color: @ini_nav_menu_hover_color;
@@ -316,7 +315,6 @@
             display: block !important;
             position: absolute;
             left: 1.25rem; // left margin of content container
-            z-index: 200; // mobile sidebar above all
             box-shadow: @box-shadow-right-bottom;
             min-width: 45%;
             max-width: 90%;

css/area_main-sidebar-search.less

@@ -191,7 +191,6 @@
         .search.main-sidebar {
             p.toggleSearch {
                 position: relative;
-                z-index: 1; // put search-toggle-button above #dw__search
                 display: block;
                 float: left;
                 width: auto;

css/area_nav-metabox.less

@@ -12,7 +12,6 @@
     .justify-content(flex-end);
 
     position: relative;
-    z-index: 1; // put meta-box above positioned content-elements such as aggregations, edit-buttons
     float: right;
     max-width: 40%;
     margin-top: -(@page_padding-top); // reverse padding-top of .page container
@@ -158,7 +157,6 @@
             }
 
             &.active {
-                z-index: 1; // put the active tab above the meta-content in .tab-pane.active
 
                 > a {
                     cursor: default;
@@ -306,7 +304,7 @@
         ul.mmissuelist {
             padding-left: 0;
             margin-top: 1rem;
-        
+
             li {
                 &.noissue {
                     list-style-type: none;

css/area_nav-pagetools.less

@@ -32,7 +32,6 @@ nav#dokuwiki__pagetools {
     @toolbox-size: 30px;
 
     top: 3.05rem;
-    z-index: 100; // put labels of the pagetools above content on hover etc.
 
     @media @screen_min-md {
         right: -2.5rem;

css/base_structure.less

@@ -63,16 +63,68 @@
     }
 }
 
-/* + + + + +  z-indeces  + + + + + */
-@media @screen_min-md {
+/* + + + + +  z-indices  + + + + + */
+@media screen {
     .nav-direct p {
-        z-index: 1000; // keyboard-navigation overlays
+        z-index: 1000; // keyboard-navigation overlays always on top
     }
 
     .top-header {
         z-index: 2; // put MagicMatcher-Dropdowns above .content and metabox-tabs
     }
 
+    #dokuwiki__aside div.nav a {
+        &:hover, &:focus, &:active {
+            z-index: 100; // show label/link above content on hover etc.
+        }
+    }
+
+    #spr__meta-box {
+        z-index: 1; // put meta-box above positioned content-elements such as aggregations, edit-buttons
+        ul.meta-tabs > li.active {
+            z-index: 1; // put the active tab above the meta-content in .tab-pane.active
+        }
+    }
+
+    nav#dokuwiki__pagetools {
+        z-index: 100; // put labels of the pagetools above content on hover etc.
+    }
+
+    #dokuwiki__detail .img-link a::before {
+        z-index: 2; // put 'view original file'-overlay above image
+    }
+
+    /* plug-in do_tasks */
+    .plugin__do_usertasks_list {
+        z-index: 200; // put tasks-list above pagetools
+    }
+
+    /* plug-in editable */
+    #dokuwiki__content.main-content div.editbutton_table {
+        z-index: 1; // for IE
+    }
+
+    /* plug-in tabinclude */
+    div#dwpl-ti-container li.dwpl-ti-tab div.selected {
+        z-index: 1; // put .slected tab above div.dwpl-ti-content-box
+    }
+}
+
+@media @screen_min-md {
+    .wide-content .search.main-sidebar p.toggleSearch {
+        z-index: 1; // put search-toggle-button above #dw__search
+    }
+}
+
+@media @screen_max-md {
+    body.show-mobile-sidebar #dokuwiki__aside {
+            z-index: 200; // mobile sidebar above all except nav-direct
+    }
+}
+/* + + + + +  end of z-indices  + + + + + */
+
+@media @screen_min-md {
+
     .content .row > .col-xs-12 {
         border-radius: 0 @ini_default_border_radius @fix_border-radius @fix_border-radius; // @ini_default_border_radius vs. @fix_border-radius
     }

css/plugins/do_tasks.less

@@ -93,7 +93,3 @@ ul.page-attributes {
         } // li
     } // ul
 }
-
-.plugin__do_usertasks_list {
-    z-index: 200; // put tasks-list above pagetools
-}

css/plugins/edittable.less

@@ -8,7 +8,6 @@
 #dokuwiki__content.main-content {
     div.editbutton_table {
         position: relative; // for IE
-        z-index: 1; // for IE
         float: left;
         margin-top: -1.46rem !important; // overwrite inline stales
 

css/plugins/tabinclude.less

@@ -34,7 +34,6 @@ div#dwpl-ti-container {
 
             &.selected {
                 position: relative;
-                z-index: 1; // put .slected tab above div.dwpl-ti-content-box
                 background-color: @ini_background;
                 color: @ini_text;
             }

css/template_detail.less

@@ -24,7 +24,6 @@
                 position: absolute;
                 top: 0;
                 left: 0;
-                z-index: 2; // put 'view original file'-overlay above image
                 display: block;
                 width: 100%;
                 box-sizing: border-box;