MDL-85659 theme_boost: Fix editor generated tables styles

theme/boost/scss/editor.scss

@@ -1,2 +1,19 @@
 /* Give editor access to all of bootstrap. */
 @import "bootstrap/bootstrap";
+
+/**
+ * Reset the Bootstrap _reboot.scss styles for tables.
+ * That reboot is breaking non-BS tables in the editor.
+ */
+table:not(.table) {
+    thead,
+    tbody,
+    tfoot,
+    tr,
+    td,
+    th {
+        border-color: $table-border-color;
+        border-style: solid;
+        border-width: $table-border-width;
+    }
+}

theme/boost/scss/moodle/undo.scss

@@ -238,3 +238,20 @@ $allow-reset-style: true !default;
         }
     }
 }
+
+/**
+ * Reset the Bootstrap _reboot.scss styles for tables.
+ * That reboot mainly affects tables added by the tiny editor.
+ */
+table:not(.table) {
+    thead,
+    tbody,
+    tfoot,
+    tr,
+    td,
+    th {
+        border-color: $table-border-color;
+        border-style: solid;
+        border-width: $table-border-width;
+    }
+}

theme/boost/style/moodle.css

@@ -38292,6 +38292,21 @@ body.reset-style .btn:not(.btn-icon) {
   border-radius: 0.6rem;
 }
 
+/**
+ * Reset the Bootstrap _reboot.scss styles for tables.
+ * That reboot mainly affects tables added by the tiny editor.
+ */
+table:not(.table) thead,
+table:not(.table) tbody,
+table:not(.table) tfoot,
+table:not(.table) tr,
+table:not(.table) td,
+table:not(.table) th {
+  border-color: var(--bs-border-color);
+  border-style: solid;
+  border-width: var(--bs-border-width);
+}
+
 body.behat-site .fixed-top {
   position: absolute;
 }

theme/classic/style/moodle.css

@@ -38226,6 +38226,21 @@ body:not(.jsenabled) .langmenu:hover > .dropdown-menu,
  * - Make the content region flex grow so it pushes things like the
  *   next activity selector to the bottom of the page.
  */
+/**
+ * Reset the Bootstrap _reboot.scss styles for tables.
+ * That reboot mainly affects tables added by the tiny editor.
+ */
+table:not(.table) thead,
+table:not(.table) tbody,
+table:not(.table) tfoot,
+table:not(.table) tr,
+table:not(.table) td,
+table:not(.table) th {
+  border-color: var(--bs-border-color);
+  border-style: solid;
+  border-width: var(--bs-border-width);
+}
+
 body.behat-site .fixed-top {
   position: absolute;
 }