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-rw-r--r--addons/web/static/src/less/bootstrap_overridden.less13
1 files changed, 13 insertions, 0 deletions
diff --git a/addons/web/static/src/less/bootstrap_overridden.less b/addons/web/static/src/less/bootstrap_overridden.less
index 0582ec8c384..ada94dbf4ca 100644
--- a/addons/web/static/src/less/bootstrap_overridden.less
+++ b/addons/web/static/src/less/bootstrap_overridden.less
@@ -72,6 +72,19 @@
@modal-inner-padding: @odoo-horizontal-padding;
@modal-title-padding: @odoo-horizontal-padding;
+// Change the z-index of the modal-backdrop elements to be equal to the
+// modal elements' ones. Bootstrap does not support multi-modals, and without
+// this rule all the modal-backdrops are below all the opened modals.
+// Indeed, bootstrap forces them to a lower z-index as the modal-backdrop
+// element (unique in their supported cases) might be put after the modal
+// element (if the modal is already in the DOM, hidden, then opened). This
+// cannot happen in odoo though as modals are not hidden but removed from
+// the DOM and are always put at the end of the body when opened.
+//
+// Note that the variable @zindex-modal-background may be renamed/removed in
+// newer versions of bootstrap.
+@zindex-modal-background: @zindex-modal;
+
//== Navs
@nav-link-padding: 10px 15px;
@nav-pills-border-radius: 0;