fix(many): form components do not take up full width in slot (#27306)

Issue number: resolves #27305

---------

<!-- Please refer to our contributing documentation for any questions on
submitting a pull request, or let us know here if you need any help:
https://ionicframework.com/docs/building/contributing -->

<!-- Some docs updates need to be made in the `ionic-docs` repo, in a
separate PR. See
https://github.com/ionic-team/ionic-framework/blob/main/.github/CONTRIBUTING.md#modifying-documentation
for details. -->

<!-- Please do not submit updates to dependencies unless it fixes an
issue. -->

<!-- Please try to limit your pull request to one type (bugfix, feature,
etc). Submit multiple pull requests if needed. -->

## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->

Checkbox, radio, range, select, and toggle take up 100% of its width
even when in a start/end slot.

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

- Checkbox, radio, range, select, and toggle do not take up 100% of its
width even when in a start/end slot.
. The "no slot" behavior is unchanged and aligns with the legacy select.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

<!-- If this introduces a breaking change, please describe the impact
and migration path for existing applications below. -->


## Other information

<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->

core/src/components/checkbox/checkbox.scss

@@ -42,8 +42,14 @@
   height: 100%;
 }
 
-:host(.in-item[slot="start"]:not(.legacy-checkbox)),
-:host(.in-item[slot="end"]:not(.legacy-checkbox)) {
+/**
+ * Checkbox can be slotted
+ * in components such as item and
+ * toolbar which is why we do not
+ * limit the below behavior to just ion-item.
+ */
+:host([slot="start"]:not(.legacy-checkbox)),
+:host([slot="end"]:not(.legacy-checkbox)) {
   width: auto;
 }
 

core/src/components/radio/radio.scss

@@ -75,8 +75,14 @@ input {
   height: 100%;
 }
 
-:host(.in-item[slot="start"]:not(.legacy-radio)),
-:host(.in-item[slot="end"]:not(.legacy-radio)) {
+/**
+ * Radio can be slotted
+ * in components such as item and
+ * toolbar which is why we do not
+ * limit the below behavior to just ion-item.
+ */
+:host([slot="start"]:not(.legacy-radio)),
+:host([slot="end"]:not(.legacy-radio)) {
   width: auto;
 }
 

core/src/components/range/range.scss

@@ -168,8 +168,14 @@
   width: 100%;
 }
 
-:host(.in-item[slot="start"]),
-:host(.in-item[slot="end"]) {
+/**
+ * Range can be slotted
+ * in components such as item and
+ * toolbar which is why we do not
+ * limit the below behavior to just ion-item.
+ */
+:host([slot="start"]),
+:host([slot="end"]) {
   width: auto;
 }
 

core/src/components/select/select.scss

@@ -95,8 +95,14 @@
 }
 
 // TODO FW-3194 - Remove :not(.legacy-select) piece
-:host(.in-item[slot="start"]:not(.legacy-select)),
-:host(.in-item[slot="end"]:not(.legacy-select)) {
+/**
+ * Select can be slotted
+ * in components such as item and
+ * toolbar which is why we do not
+ * limit the below behavior to just ion-item.
+ */
+:host([slot="start"]:not(.legacy-select)),
+:host([slot="end"]:not(.legacy-select)) {
   width: auto;
 }
 

core/src/components/select/test/label/index.html

@@ -33,10 +33,6 @@
           padding: 0;
         }
       }
-
-      ion-select {
-        width: 100%;
-      }
     </style>
   </head>
 

core/src/components/toggle/toggle.scss

@@ -42,8 +42,14 @@
   height: 100%;
 }
 
-:host(.in-item[slot="start"]:not(.legacy-toggle)),
-:host(.in-item[slot="end"]:not(.legacy-toggle)) {
+/**
+ * Toggle can be slotted
+ * in components such as item and
+ * toolbar which is why we do not
+ * limit the below behavior to just ion-item.
+ */
+:host([slot="start"]:not(.legacy-toggle)),
+:host([slot="end"]:not(.legacy-toggle)) {
   width: auto;
 }