vscode: add support for valueSelection in InputBox (#12050)

Signed-off-by: Jonah Iden <jonah.iden@typefox.io>
Co-authored-by: Paul Maréchal <paul.marechal@ericsson.com>

packages/plugin-ext/src/plugin/quick-open.ts

@@ -543,6 +543,7 @@ export class InputBoxExt extends QuickInputExt implements theia.InputBox {
 
     private _password: boolean;
     private _prompt: string | undefined;
+    private _valueSelection: readonly [number, number] | undefined;
     private _validationMessage: string | undefined;
 
     constructor(
@@ -576,6 +577,15 @@ export class InputBoxExt extends QuickInputExt implements theia.InputBox {
         this.update({ prompt });
     }
 
+    get valueSelection(): readonly [number, number] | undefined {
+        return this._valueSelection;
+    }
+
+    set valueSelection(valueSelection: readonly [number, number] | undefined) {
+        this._valueSelection = valueSelection;
+        this.update({ valueSelection });
+    }
+
     get validationMessage(): string | undefined {
         return this._validationMessage;
     }

packages/plugin/src/theia.d.ts

@@ -5415,6 +5415,17 @@ export module '@theia/plugin' {
          */
         password: boolean;
 
+        /**
+         * Selection range in the input value. Defined as tuple of two number where the
+         * first is the inclusive start index and the second the exclusive end index. When `undefined` the whole
+         * pre-filled value will be selected, when empty (start equals end) only the cursor will be set,
+         * otherwise the defined range will be selected.
+         *
+         * This property does not get updated when the user types or makes a selection,
+         * but it can be updated by the extension.
+         */
+        valueSelection: readonly [number, number] | undefined;
+
         /**
          * An event signaling when the value has changed.
          */