2 Intentions for string templates:

the first removes curly braces from a simple name variable, ${x} -> $x
and the second does the opposite $x -> ${x}

idea/testData/intentions/insertCurlyBracesToTemplate/dontInsertBrackets1.kt

@@ -0,0 +1,5 @@
+// IS_APPLICABLE: false
+fun foo() {
+    val x = 4
+    val y = "<caret>hello"
+}

idea/testData/intentions/insertCurlyBracesToTemplate/insertBrackets1.kt

@@ -0,0 +1,5 @@
+// IS_APPLICABLE: true
+fun foo() {
+    val x = 4
+    val y = "$<caret>x"
+}

idea/testData/intentions/insertCurlyBracesToTemplate/insertBrackets1.kt.after

@@ -0,0 +1,5 @@
+// IS_APPLICABLE: true
+fun foo() {
+    val x = 4
+    val y = "${x}"
+}

idea/testData/intentions/insertCurlyBracesToTemplate/insertBrackets2.kt

@@ -0,0 +1,5 @@
+// IS_APPLICABLE: true
+fun foo() {
+    val x = 4
+    val y = "something$<caret>x.somethingelse"
+}

idea/testData/intentions/insertCurlyBracesToTemplate/insertBrackets2.kt.after

@@ -0,0 +1,5 @@
+// IS_APPLICABLE: true
+fun foo() {
+    val x = 4
+    val y = "something${x}.somethingelse"
+}

idea/testData/intentions/insertCurlyBracesToTemplate/insertBrackets3.kt

@@ -0,0 +1,5 @@
+// IS_APPLICABLE: true
+fun foo() {
+    val x = 4
+    val y = "$<caret>x\n"
+}

idea/testData/intentions/insertCurlyBracesToTemplate/insertBrackets3.kt.after

@@ -0,0 +1,5 @@
+// IS_APPLICABLE: true
+fun foo() {
+    val x = 4
+    val y = "${x}\n"
+}

idea/testData/intentions/insertCurlyBracesToTemplate/insertBrackets4.kt

@@ -0,0 +1,5 @@
+// IS_APPLICABLE: true
+fun foo() {
+    val x = 4
+    val y = "$x$<caret>x$x"
+}

idea/testData/intentions/insertCurlyBracesToTemplate/insertBrackets4.kt.after

@@ -0,0 +1,5 @@
+// IS_APPLICABLE: true
+fun foo() {
+    val x = 4
+    val y = "$x${x}$x"
+}

idea/testData/intentions/insertCurlyBracesToTemplate/insertBrackets5.kt

@@ -0,0 +1,5 @@
+// IS_APPLICABLE: true
+fun foo() {
+    val x = 4
+    val y = """$x$<caret>x$x"""
+}

idea/testData/intentions/insertCurlyBracesToTemplate/insertBrackets5.kt.after

@@ -0,0 +1,5 @@
+// IS_APPLICABLE: true
+fun foo() {
+    val x = 4
+    val y = """$x${x}$x"""
+}