feat(#2) Initialize input focus to last window

src/aswm/event_handlers/map.c

@@ -26,6 +26,8 @@ void OnMapRequest(Aswm* aswm, const XMapRequestEvent* e) {
 	if(!stacked)
 		aswm_tile_window(e->display, aswm->current_desktop.tile_root, e->window);
 
+	XSetInputFocus(e->display, e->window, RevertToParent, CurrentTime);
+
 	aswm_info("Map tree:\n");
 	aswm_log_tree(aswm_info, aswm, DefaultRootWindow(aswm->display), 1);
 }

test/CMakeLists.txt

@@ -14,6 +14,7 @@ add_executable(test_aswm
 	aswm/create_windows/multiple_resizeable.c
 	aswm/create_windows/single_fixed_size.c
 	aswm/property/fix_size.c
+	aswm/input_focus/init.c
 )
 target_include_directories(test_aswm PUBLIC ${unity_SOURCE_DIR}/src)
 target_link_libraries(test_aswm libaswm unity)

test/aswm/aswm.c

@@ -4,6 +4,7 @@
 #include "../test_set_up.h"
 #include "create_windows.h"
 #include "property.h"
+#include "input_focus.h"
 
 void run_aswm(void) {
 	int stat_loc;
@@ -22,6 +23,7 @@ int main(void) {
 		RUN_TEST(create_multiple_resizeable_top_level_window);
 		RUN_TEST(create_single_fixed_size_top_level_window);
 		RUN_TEST(fix_size_of_an_existing_single_top_level_window);
+		RUN_TEST(init_input_focus);
 	}
 	tear_down_test_logger();
     return UNITY_END();

test/aswm/input_focus.h

@@ -0,0 +1,6 @@
+#ifndef TEST_ASWM_INPUT_FOCUS
+#define TEST_ASWM_INPUT_FOCUS
+
+void init_input_focus(void);
+
+#endif

test/aswm/input_focus/init.c

@@ -0,0 +1,29 @@
+#include "../../test_set_up.h"
+#include "../../utils.h"
+
+void init_input_focus() {
+	const int N = 3;
+	Window windows[N];
+	Window children[N];
+
+	for(auto i = 0; i < N; i++) {
+		windows[i] = XCreateSimpleWindow(test_display, test_root,
+				10 /*x*/, 10 /*y*/, 128 /*w*/, 128 /*h*/,
+				0 /*TODO: border width*/, CopyFromParent /*depth*/, blue(((float) i+1)/N).pixel /* background */);
+		// The top level windows might have children. Those must **not** be
+		// altered by the Window Manager
+		children[i] = XCreateSimpleWindow(test_display, windows[i],
+				0, 0, 25, 30,
+				0, CopyFromParent, red(1).pixel);
+		XMapWindow(test_display, children[i]);
+		XMapWindow(test_display, windows[i]);
+
+		Window input_focus;
+		int revert_to;
+		wait_visibility(test_display, windows[i]);
+
+		XGetInputFocus(test_display, &input_focus, &revert_to);
+
+		TEST_ASSERT_EQUAL(input_focus, windows[i]);
+	}
+}