[FIX] mrp: allow overviewing of bom with decimal quantity

Steps to reproduce the bug:
- Create a storable product with BoM:
    - add any product as component
    - save
    - Click on the BoM overview widget
    - Change the quantity of a BOM with a number that has a decimal
        value.

Problem:
The quantity is converted to an integer because this input does not
accept a decimal value.

opw-3288403

closes odoo/odoo#121801

Signed-off-by: William Henrotin (whe) <whe@odoo.com>

addons/mrp/static/src/components/bom_overview/mrp_bom_overview.xml

@@ -14,7 +14,9 @@
             changeWarehouse.bind="onChangeWarehouse"
             changeVariant.bind="onChangeVariant"
             changeBomQuantity.bind="onChangeBomQuantity"
-            changeDisplay.bind="onChangeDisplay"/>
+            changeDisplay.bind="onChangeDisplay"
+            precision="state.precision"
+            />
 
         <BomOverviewTable
             uomName="uomName"

addons/mrp/static/src/components/bom_overview_control_panel/mrp_bom_overview_control_panel.js

@@ -4,6 +4,7 @@ import { ControlPanel } from "@web/search/control_panel/control_panel";
 import { BomOverviewDisplayFilter } from "../bom_overview_display_filter/mrp_bom_overview_display_filter";
 import { Dropdown } from "@web/core/dropdown/dropdown";
 import { DropdownItem } from "@web/core/dropdown/dropdown_item";
+import { formatFloat } from "@web/views/fields/formatters";
 
 const { Component } = owl;
 
@@ -17,7 +18,7 @@ export class BomOverviewControlPanel extends Component {
     //---- Handlers ----
 
     updateQuantity(ev) {
-        const newVal = isNaN(ev.target.value) ? 1 : parseInt(ev.target.value);
+        const newVal = isNaN(ev.target.value) ? 1 : parseFloat(formatFloat(parseFloat(ev.target.value), { digits: [false, this.precision] }));
         this.props.changeBomQuantity(newVal);
     }
 
@@ -31,6 +32,10 @@ export class BomOverviewControlPanel extends Component {
     clickUnfold() {
         this.env.overviewBus.trigger("unfold-all");
     }
+
+    get precision() {
+        return this.props.precision;
+    }
 }
 
 BomOverviewControlPanel.template = "mrp.BomOverviewControlPanel";
@@ -54,6 +59,7 @@ BomOverviewControlPanel.props = {
     changeVariant: Function,
     changeBomQuantity: Function,
     changeDisplay: Function,
+    precision: Number,
 };
 BomOverviewControlPanel.defaultProps = {
     variants: {},