Add a keyboard shortcut to select the word under cursor in TextEdit

This also acts as a general-purpose "deselect" shortcut since pressing
it a second time will deselect text.

This is available both in the script editor and in TextEdit fields
in use, both in the editor and projects.

The Duplicate Line script editor shortcut was moved to Ctrl + Shift + D
since it conflicts with the new shortcut (Ctrl + D). The rationale for
doing so is that Duplicate Line is a less commonly used action, and
its behavior can be replicated by copying and pasting the current line
anyway. (With no selection active, the whole line will be copied.)

5 files changed, 50 insertions, 2 deletions

diff --git a/core/input/input_map.cpp b/core/input/input_map.cpp
index 424509eb47..a43ad4ed7d 100644
--- a/core/input/input_map.cpp
+++ b/core/input/input_map.cpp
@@ -353,6 +353,7 @@ static const _BuiltinActionDisplayName _builtin_action_display_names[] = {
     { "ui_text_scroll_down",                           TTRC("Scroll Down") },
     { "ui_text_scroll_down.OSX",                       TTRC("Scroll Down") },
     { "ui_text_select_all",                            TTRC("Select All") },
+    { "ui_text_select_word_under_caret",              TTRC("Select Word Under Caret") },
     { "ui_text_toggle_insert_mode",                    TTRC("Toggle Insert Mode") },
     { "ui_graph_duplicate",                            TTRC("Duplicate Nodes") },
     { "ui_graph_delete",                               TTRC("Delete Nodes") },
@@ -651,6 +652,10 @@ const OrderedHashMap<String, List<Ref<InputEvent>>> &InputMap::get_builtins() {
 	default_builtin_cache.insert("ui_text_select_all", inputs);
 
 	inputs = List<Ref<InputEvent>>();
+	inputs.push_back(InputEventKey::create_reference(KEY_D | KEY_MASK_CMD));
+	default_builtin_cache.insert("ui_text_select_word_under_caret", inputs);
+
+	inputs = List<Ref<InputEvent>>();
 	inputs.push_back(InputEventKey::create_reference(KEY_INSERT));
 	default_builtin_cache.insert("ui_text_toggle_insert_mode", inputs);
 
diff --git a/doc/classes/ProjectSettings.xml b/doc/classes/ProjectSettings.xml
index 24d4a8a46e..690c90a16e 100644
--- a/doc/classes/ProjectSettings.xml
+++ b/doc/classes/ProjectSettings.xml
@@ -732,6 +732,10 @@
 		</member>
 		<member name="input/ui_text_select_all" type="Dictionary" setter="" getter="">
 		</member>
+		<member name="input/ui_text_select_word_under_caret" type="Dictionary" setter="" getter="">
+			If no selection is currently active, selects the word currently under the caret in text fields. If a selection is currently active, deselects the current selection.
+			[b]Note:[/b] Currently, this is only implemented in [TextEdit], not [LineEdit].
+		</member>
 		<member name="input/ui_text_toggle_insert_mode" type="Dictionary" setter="" getter="">
 		</member>
 		<member name="input/ui_undo" type="Dictionary" setter="" getter="">
diff --git a/editor/plugins/script_text_editor.cpp b/editor/plugins/script_text_editor.cpp
index abb7a2d8a3..72a4bd8243 100644
--- a/editor/plugins/script_text_editor.cpp
+++ b/editor/plugins/script_text_editor.cpp
@@ -1896,7 +1896,7 @@ void ScriptTextEditor::register_editor() {
 #ifdef OSX_ENABLED
 	ED_SHORTCUT("script_text_editor/clone_down", TTR("Clone Down"), KEY_MASK_SHIFT | KEY_MASK_CMD | KEY_C);
 #else
-	ED_SHORTCUT("script_text_editor/clone_down", TTR("Clone Down"), KEY_MASK_CMD | KEY_D);
+	ED_SHORTCUT("script_text_editor/clone_down", TTR("Clone Down"), KEY_MASK_SHIFT | KEY_MASK_CMD | KEY_D);
 #endif
 	ED_SHORTCUT("script_text_editor/evaluate_selection", TTR("Evaluate Selection"), KEY_MASK_CMD | KEY_MASK_SHIFT | KEY_E);
 	ED_SHORTCUT("script_text_editor/trim_trailing_whitespace", TTR("Trim Trailing Whitespace"), KEY_MASK_CMD | KEY_MASK_ALT | KEY_T);
diff --git a/scene/gui/text_edit.cpp b/scene/gui/text_edit.cpp
index 053af39701..d19d95f6f4 100644
--- a/scene/gui/text_edit.cpp
+++ b/scene/gui/text_edit.cpp
@@ -3381,13 +3381,18 @@ void TextEdit::_gui_input(const Ref<InputEvent> &p_gui_input) {
 			return;
 		}
 
-		// SELECT ALL, CUT, COPY, PASTE.
+		// SELECT ALL, SELECT WORD UNDER CARET, CUT, COPY, PASTE.
 
 		if (k->is_action("ui_text_select_all", true)) {
 			select_all();
 			accept_event();
 			return;
 		}
+		if (k->is_action("ui_text_select_word_under_caret", true)) {
+			select_word_under_caret();
+			accept_event();
+			return;
+		}
 		if (k->is_action("ui_cut", true)) {
 			cut();
 			accept_event();
@@ -5149,6 +5154,39 @@ void TextEdit::select_all() {
 	update();
 }
 
+void TextEdit::select_word_under_caret() {
+	if (!selecting_enabled) {
+		return;
+	}
+
+	if (text.size() == 1 && text[0].length() == 0) {
+		return;
+	}
+
+	if (selection.active) {
+		// Allow toggling selection by pressing the shortcut a second time.
+		// This is also usable as a general-purpose "deselect" shortcut after
+		// selecting anything.
+		deselect();
+		return;
+	}
+
+	int begin = 0;
+	int end = 0;
+	const Vector<Vector2i> words = TS->shaped_text_get_word_breaks(text.get_line_data(cursor.line)->get_rid());
+	for (int i = 0; i < words.size(); i++) {
+		if (words[i].x <= cursor.column && words[i].y >= cursor.column) {
+			begin = words[i].x;
+			end = words[i].y;
+			break;
+		}
+	}
+
+	select(cursor.line, begin, cursor.line, end);
+	// Move the cursor to the end of the word for easier editing.
+	cursor_set_column(end, false);
+}
+
 void TextEdit::deselect() {
 	selection.active = false;
 	update();
diff --git a/scene/gui/text_edit.h b/scene/gui/text_edit.h
index 93214a5197..6ca50f3e2d 100644
--- a/scene/gui/text_edit.h
+++ b/scene/gui/text_edit.h
@@ -731,6 +731,7 @@ public:
 	void copy();
 	void paste();
 	void select_all();
+	void select_word_under_caret();
 	void select(int p_from_line, int p_from_column, int p_to_line, int p_to_column);
 	void deselect();
 	void swap_lines(int line1, int line2);